Sort all the #include lines with LLVM's utils/sort_includes.py which
encodes the canonical rules for LLVM's style. I noticed this had drifted
quite a bit when cleaning up LLVM, so wanted to clean up Clang as well.

llvm-svn: 198686
diff --git a/clang/lib/ASTMatchers/Dynamic/Parser.cpp b/clang/lib/ASTMatchers/Dynamic/Parser.cpp
index 59a7547..795dfe0 100644
--- a/clang/lib/ASTMatchers/Dynamic/Parser.cpp
+++ b/clang/lib/ASTMatchers/Dynamic/Parser.cpp
@@ -12,14 +12,13 @@
 ///
 //===----------------------------------------------------------------------===//
 
-#include <string>
-#include <vector>
-
 #include "clang/ASTMatchers/Dynamic/Parser.h"
 #include "clang/ASTMatchers/Dynamic/Registry.h"
 #include "clang/Basic/CharInfo.h"
 #include "llvm/ADT/Optional.h"
 #include "llvm/ADT/Twine.h"
+#include <string>
+#include <vector>
 
 namespace clang {
 namespace ast_matchers {