[DTLTO][TEST] Loosen Clang driver test regexes to fix buildbots (#159158) Make the test regexes more permissive to fix buildbot failures caused by the merge of PR #159129. This mirrors the earlier fix in PR #148908. We retain cross-project-test coverage to verify that the path content is correct. A follow-up will update the tests to robustly check the Clang executable filename, likely along the lines of PR #159151. Short-term unbreak to keep the buildbots green without reverting a chain of commits.
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