Matt Arsenault 24e80b8d04 AMDGPU: Don't enable all lanes with non-CSR VGPR spills ...

If the only VGPRs used for SGPR spilling were not CSRs, this was
enabling all laness and immediately restoring exec. This is the usual
situation in leaf functions.

llvm-svn: 361848

2019-05-28 16:46:02 +00:00

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