[PATCH] D153536: [Clang] Implement P2169 A nice placeholder with no name

[Corentin Jabot via Phabricator via cfe-commits]

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This is a C++ feature that allows the use of `_` to
declare multiple variable of that name in the same scope;
these variables can then not be refered to.

In addition, while P2169 <https://reviews.llvm.org/P2169> does not extend to parameter \
declarations, we stop warning on unused parameters of that name,
for consistency.

The feature is backported to all C++ language modes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153536

Files:
  clang/docs/ReleaseNotes.rst
  clang/include/clang/AST/Decl.h
  clang/include/clang/AST/DeclBase.h
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/include/clang/Basic/IdentifierTable.h
  clang/include/clang/Sema/Lookup.h
  clang/include/clang/Sema/Sema.h
  clang/lib/AST/Decl.cpp
  clang/lib/Frontend/InitPreprocessor.cpp
  clang/lib/Sema/SemaDecl.cpp
  clang/lib/Sema/SemaDeclCXX.cpp
  clang/lib/Sema/SemaLambda.cpp
  clang/lib/Sema/SemaLookup.cpp
  clang/test/Lexer/cxx-features.cpp
  clang/test/Lexer/unicode.c
  clang/test/SemaCXX/cxx2c-placeholder-vars.cpp
  clang/www/cxx_status.html

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