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[RISCV] Remove pseudos for vwcvt.f.x(u) with rounding mode.
vwcvt.f.x doesn't use rounding mode. The integer value fits in the mantissa of a 2x larger FP type so no rounding is required. I've remove the Uses = [FRM] that is also not needed. I deleted the isel patterns. Alternatively, we could keep them and drop the rounding mode immediate. The patterns are currently untested so I chose to delete them. If they become needed in the future, we can decide then if we should have the patterns or teach the node creation to use the non-RM form for widening. This reverts part of D142102. Reviewed By: luke Differential Revision: https://reviews.llvm.org/D154653
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