Revert "Update test_debuginfo.pl script to point to new tree location." This reverts the aforementioned patch and 2 subsequent follow-ups, as some buildbots are still failing 2 tests because of it. Investigation is ongoing into the cause of the failures. llvm-svn: 318112 GitOrigin-RevId: faf04a09f69c07f66c81167f5875518102675911