[PATCH] Added support for CUDA __launch_bounds__ attribute to CodeGen.

[Manjunath Kudlur]

Hi eliben,

Added support for CUDA __launch_bounds__ attribute to CodeGen.
Sema does have a CUDALaunchBoundsAttr, but CodeGen was doing nothing with it.
This change translates CUDALaunchBoundsAttr to maxntidx and minctasm
metadata, which NVPTX then translates to the correct PTX directives.

http://reviews.llvm.org/D3318

Files:
  lib/CodeGen/TargetInfo.cpp
  test/CodeGenCUDA/launch-bounds.cu
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