[X86] Use SARX/SHLX/SHLX instructions for (shift x (and y, (BitWidth-1)))

Fixes PR33841.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308591 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed