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The support introduced in D124306 was only added to update_llc_test_checks.py, but the motivating usecases (see https://lists.llvm.org/pipermail/llvm-dev/2021-February/148326.html) cover update_test_checks.py, update_cc_test_checks.py, and update_analyze_test_checks.py, too. Issue #59220. Differential Revision: https://reviews.llvm.org/D138836