Alexander Richardson 3459bb4f27 [TableGen] Introduce RegisterByHwMode ...

This is useful for `InstAlias` where a fixed register may depend on the
HwMode. The motivating use case for this is the RISC-V RVY ISA where
certain instructions mnemonics are remapped to take a different
register class depending on the HwMode and can be used as follows:
```
def NullReg : RegisterByHwMode<PtrRC, [RV32I, RV64I, RV64Y, RV64Y],
                                      [X0,    X0,    X0_Y,  X0_Y]>;
```

Pull Request: https://github.com/llvm/llvm-project/pull/175227

2026-02-18 17:23:10 -08:00

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