[llvm] [RFC][MC] Cache MCRegAliasIterator (PR #93510)

[Jay Foad via llvm-commits]

jayfoad wrote:

I think @perlfu did some work on speeding up MCRegAliasIterator.

I've tried to tackle the same problem by removing uses of MCRegAliasIterator whenever I can.

https://github.com/llvm/llvm-project/pull/93510