Reorder includes in Target backends to following coding standards. Remove some superfluous forward declarations.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152997 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CellSPU/SPUTargetMachine.cpp b/lib/Target/CellSPU/SPUTargetMachine.cpp
index e43f5ad..21f6b25 100644
--- a/lib/Target/CellSPU/SPUTargetMachine.cpp
+++ b/lib/Target/CellSPU/SPUTargetMachine.cpp
@@ -11,8 +11,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "SPU.h"
 #include "SPUTargetMachine.h"
+#include "SPU.h"
 #include "llvm/PassManager.h"
 #include "llvm/CodeGen/SchedulerRegistry.h"
 #include "llvm/Support/DynamicLibrary.h"