[X86][SSE] (Reapplied) Replace (V)PMOVSX and (V)PMOVZX integer extension intrinsics...

[X86][SSE] (Reapplied) Replace (V)PMOVSX and (V)PMOVZX integer extension intrinsics with generic IR (llvm)

This patch removes the llvm intrinsics VPMOVSX and (V)PMOVZX sign/zero extension intrinsics and auto-upgrades to SEXT/ZEXT calls instead. We already did this for SSE41 PMOVSX sometime ago so much of that implementation can be reused.

Reapplied now that the the companion patch (D20684) removes/auto-upgrade the clang intrinsics has been committed.

Differential Revision: http://reviews.llvm.org/D20686

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@271131 91177308-0d34-0410-b5e6-96231b3b80d8