[utils] integrate update-verify-tests with lit's --update-tests #85400
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This adds a lit plugin wrapping the core of update-verify-tests. When lit is invoked with --update-tests it will call the plugin, which checks if the failure is due to a -verify mismatch. If it is, it tries to repair the test. If the source file was originally created by split-file, the changes are propagated to the parent file. No tests are added, because I don't want to run nested llvm-lit tests in Swift's test suite, but the core functionality is tested through update-verify-tests.py.
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This adds a lit plugin wrapping the core of update-verify-tests. When
lit is invoked with --update-tests it will call the plugin, which checks
if the failure is due to a -verify mismatch. If it is, it tries to
repair the test. If the source file was originally created by
split-file, the changes are propagated to the parent file.
No tests are added, because I don't want to run nested llvm-lit tests
in Swift's test suite, but the core functionality is tested through
update-verify-tests.py.
This is based on top of #85390, only the last commit belongs to this PR.