__min_varying_<...> intrinsics added
fixed __cast_fpto<...> set of functions
setzero functions for i8 and i16
- Removed the debug code occasionally sneaked to the repo
- Put 12 knc runfails to the fail_db.txt (were invisible due to debug code)
- Several minor fixes not affecting functionality
Merge pull request #891 from ncos/knc-backend-merge

Add missing _cast_uitofp/fptoui, setzero and min_varying functions