AMDGPU/GlobalISel: Fix shift legalization for non-power-of-2

clampScalar doesn't do anything for non-power-of-2 in range.
There should probably be a combination rule to reduce the number
of matching rules.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@353526 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed