[llvm] [LLVM][NFC] Remove redundant copy parameter in lambda (PR #110299)

[David Spickett via llvm-commits]

https://github.com/DavidSpickett commented:

Since the text is only being used in a debug message, it could be `const char*`. Then you're only passing a pointer as opposed to StringRef that's pointer + size.

Also please update the PR title to reflect what you choose to do.

This is reducing copies in a sense, but it's not removing it entirely.

https://github.com/llvm/llvm-project/pull/110299