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[UpdateTestChecks] Add update_mca_test_checks.py script

Description

[UpdateTestChecks] Add update_mca_test_checks.py script

This script can be used to regenerate tests in the
test/tools/llvm-mca directory (PR36904).

Regenerated a number of tests using the pattern: test/tools/llvm-mca/*/*/*.s

Differential Revision: https://reviews.llvm.org/D45369