[RISCV] Extend redundant vrgather.vx peephole to vfmv.v.f (#135503) Extend the transform introduced in 336b290 to vfmv.v.f. This is fairly trivial and would have been in the original commit except I hadn't written the FP tests yet. If the vrgather.vi is preceeded by a vfmv.v.f which writes a superset of the lanes writen by the vrgather, and the vrgather has no passthru, then the vrgather has no semantic effect.
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