Sort the #include lines for tools/...

Again, tools are trickier to pick the main module header for than
library source files. I've started to follow the pattern of using
LLVMContext.h when it is included as a stub for program source files.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169252 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/llvm-diff/DiffConsumer.cpp b/tools/llvm-diff/DiffConsumer.cpp
index 91c1699..592ae70 100644
--- a/tools/llvm-diff/DiffConsumer.cpp
+++ b/tools/llvm-diff/DiffConsumer.cpp
@@ -12,9 +12,8 @@
 //===----------------------------------------------------------------------===//
 
 #include "DiffConsumer.h"
-
-#include "llvm/Module.h"
 #include "llvm/Instructions.h"
+#include "llvm/Module.h"
 #include "llvm/Support/ErrorHandling.h"
 
 using namespace llvm;