AMDGPU: Don't fold immediate if clamp/omod are set

Doesn't fix any practical problems because clamp/omod
are currently folded after peephole optimizer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@296375 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed