[llvm] [RISCV] Use lookup tables to find CVTFOpc (PR #88742)

[Pengcheng Wang via llvm-commits]

https://github.com/wangpc-pp commented:

> This patch contains 5 commits

I think 3 commits will be enough:
```
pick [RISCV][NFC] Move RISCVMaskedPseudoTable to RISCVInstrInfo
pick [RISCV][NFC] Include RISCVVInversePseudosTable in RISCVInstrInfo
squash [RISCV] Move RISCVInversePseudosTable to RISCVMCTargetDesc.h
pick [RISCV] Use lookup tables to find CVTFOpc
squash [RISCV] Add and use helper lookupMaskedIntrinsic
```

https://github.com/llvm/llvm-project/pull/88742