[InstCombine] shrink type of sdiv if dividend is sexted and constant divisor is small enough (PR28153)

This should fix PR28153:
https://llvm.org/bugs/show_bug.cgi?id=28153

Differential Revision: http://reviews.llvm.org/D21769



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@273951 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed