[PATCH] D137652: Remove mandatory define of optional features macros for OpenCL C 3.0

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A number of feature macros were being defined for OpenCL C 3.0 even though they are optional. I have removed these defines and updated the related tests. This should help users who are creating compilers for more limited environments.
This will also affect C++ for OpenCL 2021 since I believe its follows the same system of feature macros as OpenCL C 3.0.

This contribution is being made by Codeplay on behalf of Samsung.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D137652

Files:
  clang/include/clang/Basic/OpenCLExtensions.def
  clang/lib/Frontend/InitPreprocessor.cpp
  clang/lib/Headers/opencl-c-base.h
  clang/test/SemaOpenCL/extension-version.cl
  clang/test/SemaOpenCL/features.cl

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