[PATCH] D124751: Support -E option for HLSL.

[Xiang Li via Phabricator via cfe-commits]

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-E option will set entry function for hlsl.
The format is -E entry_name.

To avoid conflict with existing option with name 'E', add an extra prefix '--'.

A new field HLSLEntry is added to TargetOption.
To share code with HLSLShaderAttr, entry function will be add HLSLShaderAttr attribute too.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D124751

Files:
  clang/include/clang/Basic/DiagnosticSemaKinds.td
  clang/include/clang/Basic/TargetOptions.h
  clang/include/clang/Driver/Options.td
  clang/include/clang/Sema/Sema.h
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Sema/SemaDecl.cpp
  clang/test/SemaHLSL/entry.hlsl
  clang/test/SemaHLSL/prohibit_pointer.hlsl

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