[llvm] [TableGen][AsmMatcher] Resolve RegClassByHwMode kinds for all operands (PR #213479)

[Alexander Richardson via llvm-commits]

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arichardson wrote:

Since this just remaps the operand to the actually resolved class I'm not sure why it was guarded by Operand.isReg() in the first place.

https://github.com/llvm/llvm-project/pull/213479