[ExpandMemCmp] Honor prefer-vector-width.

Reviewers: gchatelet, echristo, spatel, atdt

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63769

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@364384 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed