[PATCH] CUDA host device code with two code paths

[Jacques Pienaar]

Hi pcc, eliben,

Allow CUDA host device functions with two code paths using __CUDA_ARCH__ to differentiate between code path being compiled.

For example,
__host__ __device__ void host_device_function(void) {
#ifdef __CUDA_ARCH__
  device_only_function();
#else
  host_only_function();
#endif
}

http://reviews.llvm.org/D6457

Files:
  lib/Sema/SemaCUDA.cpp
  test/SemaCUDA/function-target.cu
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