[CUDA] Removed unused __nvvm_* builtins with non-generic pointers.
[CUDA] Removed unused __nvvm_* builtins with non-generic pointers.

They were hot even hooked into CGBuiltin's machinery. Even if they were,
CUDA does not support AS-specific pointers, so there would be no legal way
no way to call these builtins.

This came up in D47154.

Differential Revision: https://reviews.llvm.org/D47845

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@335168 91177308-0d34-0410-b5e6-96231b3b80d8

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