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Debugging LIT scripts can be rather painful, as LIT directly does not specify which line has failed. Rather, FileCheck is expected to report the failing location, but it can be often ambiguous if multiple commands are tested against the same prefix. This change adds a -vv option, which echoes all output. Then detecting the error becomes straightforward: last printed line is the failing one. Of course, it could be desired to try to get failing line number directly from bash, but it involves excessive hacks on older bash versions (cf. https://stackoverflow.com/questions/24398691/how-to-get-the-real-line-number-of-a-failing-bash-command) Differential Revision: https://reviews.llvm.org/D35330 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307938 91177308-0d34-0410-b5e6-96231b3b80d8