Moved zones and zone related stuff in its own directory.

test/cctest/compiler/test-linkage.cc

Index: test/cctest/compiler/test-linkage.cc
diff --git a/test/cctest/compiler/test-linkage.cc b/test/cctest/compiler/test-linkage.cc
index 21ee39ebf261ebb9bb11faa772bb4c50f34e14e3..59ef5fdd25d0cd34e7b6d1c38a555da1cfb8358b 100644
--- a/test/cctest/compiler/test-linkage.cc
+++ b/test/cctest/compiler/test-linkage.cc
@@ -2,13 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/compilation-info.h"
 #include "src/compiler.h"
-#include "src/parsing/parse-info.h"
-#include "src/zone.h"
-
-#include "src/code-factory.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/linkage.h"
@@ -17,6 +14,8 @@
 #include "src/compiler/operator.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/schedule.h"
+#include "src/parsing/parse-info.h"
+#include "src/zone/zone.h"
 #include "test/cctest/cctest.h"
 
 namespace v8 {