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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242673 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed