[llvm] [PatternMatch] Add support for capture-and-match (NFC) (PR #149825)

[Madhur Amilkanthwar via llvm-commits]

madhur13490 wrote:

Could you please add a comment above the function to explain its use? Ideally, I'd like to have a document around this, but we are far from that.

https://github.com/llvm/llvm-project/pull/149825