Moved zones and zone related stuff in its own directory.

src/compiler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include <memory>
 
 #include "src/allocation.h"
 #include "src/bailout-reason.h"
 #include "src/contexts.h"
 #include "src/isolate.h"
-#include "src/zone.h"
+#include "src/zone/zone.h"
 
 namespace v8 {
 namespace internal {
 
 // Forward declarations.
 class CompilationInfo;
 class CompilationJob;
 class JavaScriptFrame;
 class ParseInfo;
 class ScriptData;
@@ skipping 197 matching lines @@
       state_ = State::kFailed;
     }
     return status;
   }
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_H_