Reapply "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

This reverts commit a1153cd6fedd4c906a9840987934ca4712e34cb2 with fixes
to lldb breakages.

Fixes https://github.com/l

Reapply "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

This reverts commit a1153cd6fedd4c906a9840987934ca4712e34cb2 with fixes
to lldb breakages.

Fixes https://github.com/llvm/llvm-project/issues/117145.

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Revert "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

Reverted for causing:
https://github.com/llvm/llvm-project/issues/117145

This reverts commit bdd10d9d249bd1c2a45e3de56

Revert "[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)"

Reverted for causing:
https://github.com/llvm/llvm-project/issues/117145

This reverts commit bdd10d9d249bd1c2a45e3de56a5accd97e953458.

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[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)

Starting with 41e3919ded78d8870f7c95e9181c7f7e29aa3cc4 DiagnosticsEngine
creation might perform IO. It was implicitly defaultin

[NFC] Explicitly pass a VFS when creating DiagnosticsEngine (#115852)

Starting with 41e3919ded78d8870f7c95e9181c7f7e29aa3cc4 DiagnosticsEngine
creation might perform IO. It was implicitly defaulting to
getRealFileSystem. This patch makes it explicit by pushing the decision
making to callers.

It uses ambient VFS if one is available, and keeps using
`getRealFileSystem` if there aren't any VFS.

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[InstallAPI] Support mutually exclusive parse options (#90686)

Projects like libc use mutually exclusive macros to compile files
multiple times and then merge the result into the final library. For

[InstallAPI] Support mutually exclusive parse options (#90686)

Projects like libc use mutually exclusive macros to compile files
multiple times and then merge the result into the final library. For
installapi to accept these, we'd need to parse the same declarations in
different ways. This patch adds the basic pipelining for installapi to
create the correct TBD file.

* -Xproject allows: -fmodules, -fobjc-arc, fvisibility=hidden, prefix
headers
* -Xlabel allows: -D and -U settings
* Error on 'private' and 'public' labels -X<label>
* Xplatform allows: -iframework <path> This is to support the case where
zippered frameworks want to pass in iOSSupport search path.

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[InstallAPI] Add support for aliased exports (#88750)

Apple's ld supports alias_lists, described as
```
-alias_list filename
The specified filename contains a list of aliases. T

[InstallAPI] Add support for aliased exports (#88750)

Apple's ld supports alias_lists, described as
```
-alias_list filename
The specified filename contains a list of aliases. The symbol name and its alias are on one
line, separated by whitespace. Lines starting with # are ignored.
```
To handle this for installapi-produced TBD files, pass along the same
input and account for it in verification.

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[InstallAPI] Tie lifetime of FE objects to DylibVerifier (#88189)

A few verification checks need to happen until all AST's have been
traversed, specifically for zippered framework checking. To keep

[InstallAPI] Tie lifetime of FE objects to DylibVerifier (#88189)

A few verification checks need to happen until all AST's have been
traversed, specifically for zippered framework checking. To keep source
location until that time valid, hold onto to references of
FrontendRecords + SourceManager.

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[InstallAPI] Capture & compare load commands that may differ per arch slice (#87674)

* Capture reexported libraries, allowable clients, rpaths, shared cache
eligibility.
* Add support for select X

[InstallAPI] Capture & compare load commands that may differ per arch slice (#87674)

* Capture reexported libraries, allowable clients, rpaths, shared cache
eligibility.
* Add support for select Xarch options.
* Add diagnostics related to capturing these options.
* Add support for verifying these attributes against what is encoded in
the dylib.

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[InstallAPI] Report exports discovered in binary but not in interface (#86025)

This patch completes the classes of errors installapi can detect.

[InstallAPI] Verify that declarations in headers map to exports found in dylib (#85348)

* This completes support for verifying every declaration found in a
header is discovered in the dylib. Diagno

[InstallAPI] Verify that declarations in headers map to exports found in dylib (#85348)

* This completes support for verifying every declaration found in a
header is discovered in the dylib. Diagnostics are reported for each
class for differences that are representable in TBD files.

* This patch also now captures unavailable attributes that depend on
target triples. This is needed for proper tbd file generation.

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[InstallAPI] Introduce Basic Verifier (#85106)

This adds basic support for calling the verifier on global declarations
that are expected to represent symbol exports. The driver now
exclusively use

[InstallAPI] Introduce Basic Verifier (#85106)

This adds basic support for calling the verifier on global declarations
that are expected to represent symbol exports. The driver now
exclusively uses this for knowing what symbols make up a TBD file.
Future patches will check against the dylib's symbol table.

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[InstallAPI] Add installapi specific options & diagnostics (#85100)

* A lot of `tapi installapi` options are already shared with clang, but
not all. This patch handles installapi-specific options b

[InstallAPI] Add installapi specific options & diagnostics (#85100)

* A lot of `tapi installapi` options are already shared with clang, but
not all. This patch handles installapi-specific options by filtering for
them in the initial argv input, then passing the rest to the clang
driver.
* Installapi not only generates a text file but also reports to library
developers when there are inconsistencies between an interface and its
implementation. To allow this, add support for reporting installapi
diagnostics. This will be leveraged in the verifier service.

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[InstallAPI] Break up headers and add common header for TextAPI types (#84960)

Before it gets too unwieldy, add a common header for all MachO types
that are used across InstallAPI. Also, break up t

[InstallAPI] Break up headers and add common header for TextAPI types (#84960)

Before it gets too unwieldy, add a common header for all MachO types
that are used across InstallAPI. Also, break up the types in
`InstallAPI/Frontend`. This both avoids circular dependencies and is
logically easier to maintain as more functionality gets added.

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[InstallAPI] Collect frontend attributes & ObjCInterface decls (#83378)

* This patch introduces a container class, for holding records and
attributes only collectible from the clang frontend, which

[InstallAPI] Collect frontend attributes & ObjCInterface decls (#83378)

* This patch introduces a container class, for holding records and
attributes only collectible from the clang frontend, which is a subclass
of `llvm::MachO::RecordsSlice`
* This also prunes out collecting declarations from headers that aren't
considered input to installapi.
* Uses these constructs for collecting global objective-c interfaces.

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clang-installapi: remove setInstalledDir

[InstallAPI] Hookup Input files & basic ASTVisitor (#82552)

This patch takes in json files as input to determine that header files
to process, and in which order, to pass along for CC1 invocations.

[InstallAPI] Hookup Input files & basic ASTVisitor (#82552)

This patch takes in json files as input to determine that header files
to process, and in which order, to pass along for CC1 invocations. This
patch also includes an ASTVisitor to collect simple global variables.

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[InstallAPI] Set InstallAPI as a standalone tool instead of CC1 action (#82293)

Installapi has important distinctions when compared to the clang driver,
so much that, it doesn't make much sense to

[InstallAPI] Set InstallAPI as a standalone tool instead of CC1 action (#82293)

Installapi has important distinctions when compared to the clang driver,
so much that, it doesn't make much sense to try to integrate into it.

This patch partially reverts the CC1 action & driver support to replace
with its own driver as a clang tool.

For distribution, we could use `LLVM_TOOL_LLVM_DRIVER_BUILD` mechanism
for integrating the functionality into clang such that the toolchain
size is less impacted.

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