[Attributor] Do not use liveness of the wrong function

[jdoerfert]

If we use AAIsDead of the wrong function all queries will result in "is dead". This problem is at least present in the genericValueTraversal, could be other places too.

[jdoerfert]

/cherry-pick 668c5c6

[llvmbot]

Failed to cherry-pick: 668c5c6

https://github.com/llvm/llvm-project/actions/runs/1855577960

Please manually backport the fix and push it to your github fork. Once this is done, please add a comment like this:

/branch <user>/<repo>/<branch>

[jdoerfert]

/branch jdoerfert/llvm-project/issue53872

[llvmbot]

/pull-request llvmbot#81