[PATCH] D135721: [HLSL] Added HLSL this as a reference

[Grace Jennings via Phabricator via cfe-commits]

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This change makes `this` a reference instead of a pointer in
HLSL. HLSL does not have the `->` operator, and accesses through `this`
are with the `.` syntax. Tests were added and altered to make sure
the AST accurately reflects the types.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D135721

Files:
  clang/include/clang/AST/ExprCXX.h
  clang/lib/AST/ExprClassification.cpp
  clang/lib/CodeGen/CGExpr.cpp
  clang/lib/Sema/HLSLExternalSemaSource.cpp
  clang/lib/Sema/SemaExprCXX.cpp
  clang/lib/Sema/SemaExprMember.cpp
  clang/test/AST/HLSL/RWBuffer-AST.hlsl
  clang/test/AST/HLSL/this-reference-template.hlsl
  clang/test/AST/HLSL/this-reference.hlsl

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