DAGCombiner: Combine SDIV with non-splat vector pow2 divisor

Summary:
Extend existing SDIV combine for pow2 constant divider to handle
non-splat vectors of pow2 constants.

Reviewers: RKSimon, craig.topper, spatel, hfinkel, efriedma

Reviewed By: RKSimon

Subscribers: magabari, llvm-commits

Differential Revision: https://reviews.llvm.org/D42479

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@329525 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed