[llvm] [MLGO] Fix logging verbosity in scripts (PR #107818)

[Mircea Trofin via llvm-commits]

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@@ -20,8 +20,8 @@
 
 To change the logging verbosity, pass an integer representing the desired
 verbosity to the --verbosity flag. Use 0 for all logs, status information,
-and detailed debug information, -1 for solely warnings, and -2 to not produce
-any output.
+and detailed debug information, 30 for solely warnings, and 50 or higher to
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mtrofin wrote:

why not leave the flag values to 0, -1, -2 and then map them on line 128 accordingly? 

https://github.com/llvm/llvm-project/pull/107818