[PATCH] D64589: [UpdateTestChecks] Emit warning when invalid value for -check-prefix option

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a reviewer: gbedwell.
RKSimon added a comment.

Please can you add this to update_analyze_test_checks.py and update_mca_test_checks.py as well? update_cc_test_checks.py maybe - not sure what state that is in though tbh.


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  https://reviews.llvm.org/D64589/new/

https://reviews.llvm.org/D64589