Craig Topper f59307bfdc [RISCV] Teach needVSETVLIPHI to handle mask register instructions.
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.

Reviewed By: frasercrmck

Differential Revision: https://reviews.llvm.org/D113204
2021-11-15 09:57:28 -08:00
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