Sort the #include lines for unittests/...

I've tried to place sensible headers at the top as main-module headers.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@169243 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/AST/CommentParser.cpp b/unittests/AST/CommentParser.cpp
index 8fde247..f9bf58c 100644
--- a/unittests/AST/CommentParser.cpp
+++ b/unittests/AST/CommentParser.cpp
@@ -7,20 +7,19 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/AST/CommentParser.h"
 #include "clang/Basic/SourceManager.h"
-#include "clang/Basic/FileManager.h"
+#include "clang/AST/Comment.h"
+#include "clang/AST/CommentCommandTraits.h"
+#include "clang/AST/CommentLexer.h"
+#include "clang/AST/CommentSema.h"
 #include "clang/Basic/Diagnostic.h"
 #include "clang/Basic/DiagnosticOptions.h"
-#include "clang/AST/Comment.h"
-#include "clang/AST/CommentLexer.h"
-#include "clang/AST/CommentParser.h"
-#include "clang/AST/CommentSema.h"
-#include "clang/AST/CommentCommandTraits.h"
+#include "clang/Basic/FileManager.h"
 #include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Allocator.h"
-#include <vector>
-
 #include "gtest/gtest.h"
+#include <vector>
 
 using namespace llvm;
 using namespace clang;