Matt Arsenault 5fddf09187 AMDGPU/GlobalISel: Insert waterfall loop for vector indexing
The register index can only really be an SGPR. Lie that a VGPR index
is legal, and then rewrite the instruction in a waterfall loop to
handle the index.

llvm-svn: 357235
2019-03-29 03:54:56 +00:00
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