[clang][ExtractAPI] Fix handling of anonymous TagDecls (#87772)

This changes the handling of anonymous TagDecls to the following rules:
- If the TagDecl is embedded in the declaration for some VarD

[clang][ExtractAPI] Fix handling of anonymous TagDecls (#87772)

This changes the handling of anonymous TagDecls to the following rules:
- If the TagDecl is embedded in the declaration for some VarDecl (this
is the only possibility for RecordDecls), then pretend the child decls
belong to the VarDecl
- If it's an EnumDecl proceed as we did previously, i.e., embed it in
the enclosing DeclContext.

Additionally this fixes a few issues with declaration fragments not
consistently including "{ ... }" for anonymous TagDecls. To make testing
these additions easier this patch fixes some text declaration fragments
merging issues and updates tests accordingly.

rdar://121436298

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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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ExtractAPI: use zero-based indices for line/column in symbol graph (#71753)

Other implementations of the symbol graph format use zero-based indices
for source locations, which causes problems when

ExtractAPI: use zero-based indices for line/column in symbol graph (#71753)

Other implementations of the symbol graph format use zero-based indices
for source locations, which causes problems when combined with clang's
current one-based indices. This commit sets ExtractAPI's symbol graph
output to use zero-based indices to align with other implementations.

rdar://107639783

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[clang][ExtractAPI] Refactor C++ method and field visitation

Refactor visitation for C++ record children by following the Visitor's CRTP.
Expand VisitCXXField, VisitCXXMethod for non-templates and i

[clang][ExtractAPI] Refactor C++ method and field visitation

Refactor visitation for C++ record children by following the Visitor's CRTP.
Expand VisitCXXField, VisitCXXMethod for non-templates and introduce VisitCXXConstructor, VisitCXXDestructor.
Handle relationships by finding the parent's Record via USR from DeclContext.

Depends on D158029

Reviewed By: dang

Differential Revision: https://reviews.llvm.org/D158031

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[clang][ExtractAPI] Add support for C++ classes with fix

Reintroduce D153557 with fix for use-after-free from f4de606ef271 and minor changes.

Reviewed By: dang

Differential Revision: https://revie

[clang][ExtractAPI] Add support for C++ classes with fix

Reintroduce D153557 with fix for use-after-free from f4de606ef271 and minor changes.

Reviewed By: dang

Differential Revision: https://reviews.llvm.org/D157007

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[clang][ExtractAPI] Add support for C++ classes

Add ExtractAPI support C++ classes, fields, methods, and various qualifiers and specifiers

Differential Revision: https://reviews.llvm.org/D153557