[llvm] [GOFF] Wrap debug output with LLVM_DEBUG (PR #87252)

[Kai Nacke via llvm-commits]

redstar wrote:

> looks good. It might be helpful to but a tag at the beginning of the output so people know this is the GOFF record and a new line at the end.

I agree that the formatting of the output could be better. (The user must request `--debug-only=goff` so there is no need to tag the output.) I leave this to a later change, since my main point is to remove the debug output in normal operation.

https://github.com/llvm/llvm-project/pull/87252