[PATCH] D95187: [DebugInfo][CodeView] Use <lambda_n> as the display name for lambdas.

[Amy Huang via Phabricator via cfe-commits]

akhuang created this revision.
akhuang added reviewers: rnk, dblaikie.
akhuang requested review of this revision.
Herald added a project: clang.
Herald added a subscriber: cfe-commits.

Currently (for codeview) lambdas have a string like `<lambda_0>` in
their mangled name, and don't have any display name. This change uses the
`<lambda_0>` as the display name, which helps distinguish between lambdas
in -gline-tables-only, since there are no linkage names there. 
It also changes how we display lambda names; previously we used
`<unnamed-tag>`; now it will show `<lambda_0>`.

I added a function to the mangling context code to create this string;
for Itanium it just returns an empty string.

Bug: https://bugs.llvm.org/show_bug.cgi?id=48432


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95187

Files:
  clang/include/clang/AST/Mangle.h
  clang/lib/AST/ItaniumMangle.cpp
  clang/lib/AST/MicrosoftMangle.cpp
  clang/lib/CodeGen/CGDebugInfo.cpp
  clang/test/CodeGenCXX/debug-info-codeview-unnamed.cpp
  clang/test/CodeGenCXX/debug-info-gline-tables-only-codeview.cpp

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