Merging r258537:

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r258537 | Matthew.Arsenault | 2016-01-22 11:47:54 -0800 (Fri, 22 Jan 2016) | 6 lines

AMDGPU: Fix crash with invariant markers

The promote alloca pass didn't handle these intrinsics and crashed.
These intrinsics should accept any address space, but for now just
erase them to avoid breaking.

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llvm-svn: 271484