[RISCV][VLOPT] Add vector fp-conversion instruction to isSupportedInstr (#122033) When these instructions are marked nofpexcept, we can optimize them. There are some added toggles in the output, likley because other noexcept fp instructions are not part of isSupportedInstr yet. We may want to avoid marking an instruction as isSupported in the future if any of its FP users are missing nofpexcept to avoid added toggles. However, we seem to get some GPRs back as a result of this change, which may outweigh the cost of avoiding extra toggles. The plan is to follow this patch up with added support for more FP instructions in the same way. The instructions in this patch are a natural starting point because they allow us to test with integer instructions which have good support already.
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