[PATCH] [CUDA] Support for built-in cuda variables (threadIdx and its friends).

[Artem Belevich]

Hi eliben, echristo, rnk,

The patch implements support for [[ http://docs.nvidia.com/cuda/cuda-c-programming-guide/#built-in-variables| built-in CUDA variables ]] using __declattr((property)) attribute to convert all built-in variable reads into appropriate llvm builtin calls.

This makes it possible to compile typical CUDA source code that relies on built-in variables.

http://reviews.llvm.org/D9064

Files:
  lib/Headers/CMakeLists.txt
  lib/Headers/cuda/cuda_builtin_vars.h
  test/CodeGenCUDA/cuda-builtin-vars.cu

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