[utils][UpdateTestChecks] Warn about possible target triple mismatch (#149645) Aims to improve error reporting by printing a warning if the target function regex that has been selected finds no matches. For example, a `-mtriple=arm64-apple-darwin` runline, would map to the `arm64` prefix by `update_llc_test_checks.py` and wouldn't match Apple's function layout, generating some not understandable garbage checks. The implementation changes `common.process_run_line` to return an abstract indicator of number of functions processed, without breaking the drivers. Then `update_llc_test_checks.py` prints a driver specific error message.
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