[PATCH] D88250: [CUDA] Added dim3/uint3 conversion functions to builtin vars.

[Artem Belevich via Phabricator via cfe-commits]

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This is needed to compile some headers in CUDA-11 that assume that threadIdx is
implicitly convertible to dim3. With NVCC, threadIdx is uint3 and there's
dim3(uint3) constructor, so that works. Clang uses a special type for the threadIdx, 
so dim3 can't be constructed from it. Instead, this patch adds conversion function to the
builtin variable classes.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D88250

Files:
  clang/lib/Headers/__clang_cuda_builtin_vars.h
  clang/lib/Headers/__clang_cuda_runtime_wrapper.h

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