[llvm] Greedy: Make trySplitAroundHintReg try to match hints with subreg copies (PR #160294)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> For the record, not convinced the sub-reg handling is optimal here, but I think this is an improvement over the prior code, so I'm fine with that being addressed later on.

Yes, it's all in pretty bad shape and extremely time consuming to fix each piece 



https://github.com/llvm/llvm-project/pull/160294