AMDGPU: Use CreateStackObject instead of CreateSpillStackObject

I'm not sure what the difference is, but no other target
uses this for emergency spill slots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278272 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed