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

[Aiden Grossman 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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boomanaiden154 wrote:

The mapping is non-linear, and remapping everything feels a bit like shoehorning the `absl` specifics into the now non-`absl` specific code.

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