Update to match LLVM r300135.

Remove "REQUIRES: long_tests" from test/Driver/response-file.c since it is now about 10x faster. (We can add that back if it's still too slow for some buildbot.)


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@300136 91177308-0d34-0410-b5e6-96231b3b80d8