test: Speed up test/Misc/verify-swift-feature-testing.test-sh
some more
#79764
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Instead of first invoking
grep
to get a list of files with matches, and then invoking it again on each file to find lines with matches, invoke it once on the entire test suite to get a list of paths and lines with matches, and parse that output into a dictionary that maps file paths to lists of lines.This further reduces run time from ~2.5s to ~1s.