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/X86/X86COFFMachineModuleInfo.h b/lib/Target/X86/X86COFFMachineModuleInfo.h
index 63c08f1..0cec95a 100644
--- a/lib/Target/X86/X86COFFMachineModuleInfo.h
+++ b/lib/Target/X86/X86COFFMachineModuleInfo.h
@@ -14,9 +14,9 @@
 #ifndef X86COFF_MACHINEMODULEINFO_H
 #define X86COFF_MACHINEMODULEINFO_H
 
+#include "X86MachineFunctionInfo.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/ADT/DenseSet.h"
-#include "X86MachineFunctionInfo.h"
 
 namespace llvm {
   class X86MachineFunctionInfo;