Remove staled change from merging

Author: yoonseoch

llvm/lib/Target/AMDGPU/SIPostRABundler.cpp

@@ -15,7 +15,6 @@
 #include "SIPostRABundler.h"
 #include "AMDGPU.h"
 #include "GCNSubtarget.h"
-#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
 #include "llvm/ADT/SmallSet.h"
 #include "llvm/CodeGen/MachineFunctionPass.h"