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[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
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