[CUDA] removed unneeded __nvvm_reflect_anchor()

[tra]

Summary

Since r265060 LLVM infers correct __nvvm_reflect attributes.

lib/Headers/__clang_cuda_runtime_wrapper.h

 // Restore state of __CUDA_ARCH__ and __THROW we had on entry.
 #pragma pop_macro("__CUDA_ARCH__")
 #pragma pop_macro("__THROW")
 
 // Set up compiler macros expected to be seen during compilation.
 #undef __CUDABE__
 #define __CUDACC__
 
-#if defined(__CUDA_ARCH__)
-// We need to emit IR declaration for non-existing __nvvm_reflect() to
-// let backend know that it should be treated as const nothrow
-// function which is what NVVMReflect pass expects to see.
-extern "C" __device__ __attribute__((const)) int __nvvm_reflect(const void *);
-static __device__ __attribute__((used)) int __nvvm_reflect_anchor() {
-  return __nvvm_reflect("NONE");
-}
-#endif
-
 extern "C" {
 // Device-side CUDA system calls.
 // http://docs.nvidia.com/cuda/ptx-writers-guide-to-interoperability/index.html#system-calls
 // We need these declarations and wrappers for device-side
 // malloc/free/printf calls to work without relying on
 // -fcuda-disable-target-call-checks option.
 __device__ int vprintf(const char *, const char *);
 __device__ void free(void *) __attribute((nothrow));