[PATCH] D128845: [HLSL]Add -O and -Od option for dxc mode.

[Xiang Li via Phabricator via cfe-commits]

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Two new dxc mode options -O and -Od are added for dxc mode.
-O is just alias of existing cc1 -O option.
-Od will be lowered into -O0 and -dxc-opt-disable.

-dxc-opt-disable is cc1 option added to for build ShaderFlags.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128845

Files:
  clang/include/clang/Basic/TargetOptions.h
  clang/include/clang/Driver/Options.td
  clang/lib/CodeGen/CGHLSLRuntime.cpp
  clang/lib/Driver/ToolChains/Clang.cpp
  clang/lib/Driver/ToolChains/HLSL.cpp
  clang/lib/Frontend/CompilerInvocation.cpp
  clang/test/CodeGenHLSL/disable_opt.hlsl
  clang/test/Driver/dxc_O.hlsl

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