ConstantFold: Zero-sized globals might land on top of another global

A zero sized array is zero sized and might share its address with
another global.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223684 91177308-0d34-0410-b5e6-96231b3b80d8
R600/SI: Move continue after checking s_mov_b32.

There's nothing else to bother trying to shrink these.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223686 91177308-0d34-0410-b5e6-96231b3b80d8