When compiletest'ing src/test/mir-opt, check timestamps. #39717
Merged
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The tests in src/test/mir-opt embed references to generated files. The names of the generated files embed node id's, which will change depending on the content of the original source.
To guard against comparisons against stale output, check the timestamps of the supposed output against the timestamp of the original source (i.e. any output should be at least as new as the source that was recompiled).
Fix #39690.