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[RISCV] Teach needVSETVLIPHI to handle mask register instructions.

Authored by craig.topper on Thu, Nov 4, 10:37 AM.



This handles the case where the mask register instruction input
comes from a Phi of vsetvlis. If the VLMAX is the same as the VLMAX
required by the mask register instruction, we can avoid a vsetvli.

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craig.topper created this revision.Thu, Nov 4, 10:37 AM
craig.topper requested review of this revision.Thu, Nov 4, 10:37 AM
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This revision is now accepted and ready to land.Mon, Nov 15, 9:30 AM

Though the clang-format thing should probably be addressed.

This revision was landed with ongoing or failed builds.Mon, Nov 15, 9:57 AM
This revision was automatically updated to reflect the committed changes.