[Diffusion] rL242673: AMDGPU/SI: Add VI patterns to select FLAT instructions for global memory ops

[Tom Stellard]

tstellarAMD added a subscriber: tstellarAMD.
tstellarAMD added auditors: hans, 3.7-release.
tstellarAMD added a comment.

This is a bug fix for the AMDGPU backend, is it OK to merge?  I am the code owner and I approve this commit.


Users:
  hans (Auditor)
  3.7-release (Auditor)

http://reviews.llvm.org/rL242673