Make LowerVSETCC a static function and use MVT instead of EVT.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172969 91177308-0d34-0410-b5e6-96231b3b80d8
[docs] Update IRC information.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172970 91177308-0d34-0410-b5e6-96231b3b80d8
Fix a build error.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@172971 91177308-0d34-0410-b5e6-96231b3b80d8