[AMDGPU] Fix CS scratch setup on pre-GCN3 ASICs
Summary:
Prior to GCN3 s_load_dword offsets are in dwords rather than bytes.
Thus the scratch buffer descriptor offset must be adjusted for pre-GCN3 ASICs.
Reviewers: nhaehnle, tpr
Reviewed By: nhaehnle
Subscribers: sheredom, arsenm, kzhuravl, jvesely, wdng, yaxunl, dstuttard, t-tye, jfb, llvm-commits
Differential Revision: https://reviews.llvm.org/D56496
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353530
91177308-0d34-0410-b5e6-
96231b3b80d8
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