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/Mips/MipsTargetMachine.h b/lib/Target/Mips/MipsTargetMachine.h
index 19ae142..80c00e8 100644
--- a/lib/Target/Mips/MipsTargetMachine.h
+++ b/lib/Target/Mips/MipsTargetMachine.h
@@ -14,15 +14,15 @@
 #ifndef MIPSTARGETMACHINE_H
 #define MIPSTARGETMACHINE_H
 
-#include "MipsSubtarget.h"
+#include "MipsFrameLowering.h"
 #include "MipsInstrInfo.h"
 #include "MipsISelLowering.h"
-#include "MipsFrameLowering.h"
+#include "MipsJITInfo.h"
 #include "MipsSelectionDAGInfo.h"
+#include "MipsSubtarget.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetFrameLowering.h"
-#include "MipsJITInfo.h"
 
 namespace llvm {
   class formatted_raw_ostream;