[InstCombine] Added support for (X >>s C) << C --> X & (-1 << C)

Differential Revision: https://reviews.llvm.org/D36743


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310949 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed