[llvm] [SelectionDAG] Add support to filter SelectionDAG dumps during ISel by function names (PR #72696)

[Paul Kirth via llvm-commits]

ilovepi wrote:

Can you document the new flag and behavior? This seems like something useful to communicate. I guess we should probably mention the change of behavior in the release notes too. 

https://github.com/llvm/llvm-project/pull/72696