[PATCH] D122627: [HLSL] Fix MSFT Attribute parsing, add numthreads

[Chris Bieneman via Phabricator via cfe-commits]

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HLSL uses Microsoft-style attributes `[attr]`, which clang mostly
ignores. For HLSL we need to handle known Microsoft attributes, and to
maintain C/C++ as-is we ignore unknown attributes.

To utilize this new code path, this change adds the HLSL `numthreads`
attribute.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D122627

Files:
  clang/include/clang/Basic/Attr.td
  clang/include/clang/Basic/AttrDocs.td
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/include/clang/Parse/Parser.h
  clang/lib/Parse/ParseDeclCXX.cpp
  clang/lib/Sema/SemaDecl.cpp
  clang/lib/Sema/SemaDeclAttr.cpp
  clang/test/SemaHLSL/lit.local.cfg
  clang/test/SemaHLSL/num_threads.hlsl

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