[InstCombine] Add splat vector constant support to foldICmpAddOpConst.

Differential Revision: https://reviews.llvm.org/D50946

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340231 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed