Add option -i to prioritize test runs by source file modification time and
previous failure state.
This optimal scheduling reduces typical test-and-fix iteration times to a
matter of seconds by rapidly answering the questions:
1) Did my recent change fix tests that were previously failing?
2) Do the tests I just wrote / modified still work?
The current implementation requires write permissions to the source tree
because it uses mtimes to track failures.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@198150 91177308-0d34-0410-b5e6-96231b3b80d8
9ad6e339c3