[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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@330246 91177308-0d34-0410-b5e6-96231b3b80d8
35 files changed