Reenable external categories (#87357)

Reenables b31414bf4f9898f7817a9fcf8a91f62ec26f3eaf.

Also adds a new warning for missing `--symbol-graph-dir` arg when
`--emit-extension-symbol-graphs` is pr

Reenable external categories (#87357)

Reenables b31414bf4f9898f7817a9fcf8a91f62ec26f3eaf.

Also adds a new warning for missing `--symbol-graph-dir` arg when
`--emit-extension-symbol-graphs` is provided. This also reverts the
commit that removed.

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Revert "[clang][ExtractAPI] Add ability to create multiple symbol graphs (#86676)"

This failed the test suite due to missing DiagGroup for a new warning.

This reverts commit b31414bf4f9898f7817a9fc

Revert "[clang][ExtractAPI] Add ability to create multiple symbol graphs (#86676)"

This failed the test suite due to missing DiagGroup for a new warning.

This reverts commit b31414bf4f9898f7817a9fcf8a91f62ec26f3eaf.

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[clang][ExtractAPI] Add ability to create multiple symbol graphs (#86676)

This extends ExtractAPI to take into account symbols defined in categories to types defined in an external module.
This int

[clang][ExtractAPI] Add ability to create multiple symbol graphs (#86676)

This extends ExtractAPI to take into account symbols defined in categories to types defined in an external module.
This introduces 2 new command line flags, `--symbol-graph-dir=DIR` and `--emit-extension-symbol-graphs`, when used together this generates additional symbol graph files at `DIR/ExtendedModule@ProductName.symbols.json` for each external module that is extended in this way.

Additionally this makes some cleanups to tests to make them more resilient and cleans up the `APISet` data structure.

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[clang][ExtractAPI] Reland ExtractAPI for libclang improvements

This relands the changes that were originally introduced by:
- https://reviews.llvm.org/D146656
- https://reviews.llvm.org/D147138

Th

[clang][ExtractAPI] Reland ExtractAPI for libclang improvements

This relands the changes that were originally introduced by:
- https://reviews.llvm.org/D146656
- https://reviews.llvm.org/D147138

This also fixes the leak that led to these changes being reverted

Differential Revision: https://reviews.llvm.org/D147234

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Revert "Revert "Revert ExtractAPI from https://reviews.llvm.org/D146656""

This reverts commit 79116475124112051625b1a0665e35c861bb13fd.

Broke the ASan bots. See more information in
https://reviews.

Revert "Revert "Revert ExtractAPI from https://reviews.llvm.org/D146656""

This reverts commit 79116475124112051625b1a0665e35c861bb13fd.

Broke the ASan bots. See more information in
https://reviews.llvm.org/rG79116475124112051625b1a0665e35c861bb13fd

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Revert "Revert ExtractAPI from https://reviews.llvm.org/D146656"

This reverts commit 158a431227a876306fe5838936413dd51588d0c6.

Revert ExtractAPI from https://reviews.llvm.org/D146656

[clang][ExtractAPI] Refactor ExtractAPIVisitor to make it more extensible

Use CRTP to enable creating statically dispatched subclasses of
ExtractAPIVisitor.
This enables adding extension points and

[clang][ExtractAPI] Refactor ExtractAPIVisitor to make it more extensible

Use CRTP to enable creating statically dispatched subclasses of
ExtractAPIVisitor.
This enables adding extension points and customising the behavior more
easily.

This is used in CXExtractAPI.cpp to create a specialized visitor for
Libclang as well as streamlining the batch implementation in ExtractAPIConsumer.cpp

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[clang][ExtractAPI] Add support for single symbol SGF and libclang support

This is mainly adding an entry point to `SymbolGraphSerializer` at
`serializeSingleSymbolSGF` and exposing the necessary da

[clang][ExtractAPI] Add support for single symbol SGF and libclang support

This is mainly adding an entry point to `SymbolGraphSerializer` at
`serializeSingleSymbolSGF` and exposing the necessary data to make this
possible. Additionaly there are some changes to how symbol kinds and
path components are serialized to make the usage more ergonomic in
`serializeSingleSymbolSGF`.

On the libclang side this introduces APIs to:
- create an APISet from a TU
- dispose of an APISet
- query an APISet for a single symbol SGF for a given USR.
- generate a single symbol SGF for a given CXCursor, this only traverses
the necessary AST nodes to construct the result as oppposed as going
through the entire AST.

Differential Revision: https://reviews.llvm.org/D139115

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[clang][extract-api] Add support for typedefs

Typedef records consist of the symbol associated with the underlying
TypedefDecl and a SymbolReference to the underlying type. Additionally
typedefs for

[clang][extract-api] Add support for typedefs

Typedef records consist of the symbol associated with the underlying
TypedefDecl and a SymbolReference to the underlying type. Additionally
typedefs for anonymous TagTypes use the typedef'd name as the symbol
name in their respective records and USRs. As a result the declaration
fragments for the anonymous TagType are those for the associated
typedef. This means that when the user is defining a typedef to a
typedef to a anonymous type, we use a reference the anonymous TagType
itself and do not emit the typedef to the anonymous type in the
generated symbol graph, including in the type destination of further
typedef symbol records.

Differential Revision: https://reviews.llvm.org/D123019

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