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

[Artem Belevich]

- Restricted access to built-in variables.
- Implemented warpSize as class subject to the same restrictions as other built-in variables.
- Made all built-in variables extern weak in case we ever emit any references to them.
- Added a test case to check diagnostics on attempt to construct or improperly access a built-in variable.


http://reviews.llvm.org/D9064

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

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