reimplement vector comparisons as [fi]cmp+sext instead of using v[if]cmp.
Also, enable them in sema so that they are tested, and now that the x86 backend
has stablized.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74983 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed