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

llvm-svn: 152997
diff --git a/llvm/lib/Target/Mips/MipsFrameLowering.cpp b/llvm/lib/Target/Mips/MipsFrameLowering.cpp
index e83c64e..ebfbb4a 100644
--- a/llvm/lib/Target/Mips/MipsFrameLowering.cpp
+++ b/llvm/lib/Target/Mips/MipsFrameLowering.cpp
@@ -11,8 +11,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "MipsAnalyzeImmediate.h"
 #include "MipsFrameLowering.h"
+#include "MipsAnalyzeImmediate.h"
 #include "MipsInstrInfo.h"
 #include "MipsMachineFunction.h"
 #include "MCTargetDesc/MipsBaseInfo.h"