Disables the portions of the regional break test file corresponding to
Unicode 8.0 vs 9.0 differences. Once the compiler and stdlib are in
sync with Unicode 9.0, and the legacy tries are dropped, we should
splat down newer versions of these test files.
This is only for the frontend, not for stdlib. The implementation is very
slow, optimizing it is the next step.
rdar://16755123 rdar://16013860
Swift SVN r18928
