AMDGPU: Generalize shl combine

Reduce 64-bit shl with constant > 32. We already special cased
this for the == 32 case, but this also works for any >= 32 constant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258092 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed