update travis

Update travis/github repo

Update LLVM patches to build on mingw32 with case-sensitive filesystems

Update .travis.yml

fix patch

update check-patches to also do a reverse check

Merge branch 'vc/addpatch'

disable polly

Merge pull request staticfloat#26 from staticfloat/vc/vncoercionfix

add patch from julia/JuliaLang#28362

Merge pull request staticfloat#25 from staticfloat/vc/ptrtoint

Ptrtoint and perf patches