This change implements the following three logical vector operations:

This change implements the following three logical vector operations:

veqv (vector equivalence)
vnand
vorc
I increased the AddedComplexity for these instructions to 500 to ensure they are generated instead of issuing other VSX instructions.

Phabricator review: http://reviews.llvm.org/D7469

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228580 91177308-0d34-0410-b5e6-96231b3b80d8