[llvm] [LV][NFC] Fix erroneous debug message emitted during legality checks (PR #226162)

[David Sherwood via llvm-commits]

david-arm wrote:

github is becoming increasingly unusable for LLVM development it seems. It grows more erratic every day. Yesterday there was a permissions error when trying to merge PRs, today I got the message "Unable to read response from server. Please try again later". Then, when attempting to merge again it says "Merge already in progress"

https://github.com/llvm/llvm-project/pull/226162