R600MachineScheduler.cpp: Fix use cases of dbgs(). Don't include <iostream> here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176797 91177308-0d34-0410-b5e6-96231b3b80d8
Suppress atomic(32|64).ll as XFAIL on win32 codegen. Investigating.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176798 91177308-0d34-0410-b5e6-96231b3b80d8