Merging r242673:

Merging r242673:
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r242673 | tstellar | 2015-07-20 07:28:41 -0700 (Mon, 20 Jul 2015) | 11 lines

AMDGPU/SI: Add VI patterns to select FLAT instructions for global memory ops

Summary:
The MUBUF addr64 bit has been removed on VI, so we must use FLAT
instructions when the pointer is stored in VGPRs.

Reviewers: arsenm

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D11067
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_37@242685 91177308-0d34-0410-b5e6-96231b3b80d8