[CUDA] removed unneeded __nvvm_reflect_anchor()
[CUDA] removed unneeded __nvvm_reflect_anchor()

Since r265060 LLVM infers correct __nvvm_reflect attributes, so
explicit declaration of __nvvm_reflect() is no longer needed.

Differential Revision: http://reviews.llvm.org/D19074

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@267062 91177308-0d34-0410-b5e6-96231b3b80d8

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