revert r344082: [InstCombine] reverse 'trunc X to <N x i1>' canonicalization

This commit accidentally included the diffs from D53057.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@344178 91177308-0d34-0410-b5e6-96231b3b80d8
9 files changed