detab test/runnable/testswitch.d
Add -w option in PERMUTE_ARGS, and fix test cases.

As far as I see, these changes does not affect to the things which are actually tested.
fix Issue 9263 - statement is not reachable when statement is reachable
Merge pull request #1431 from 9rnsr/fix9263

Issue 9263 - statement is not reachable when statement is reachable