Moved zones and zone related stuff in its own directory.

src/wasm/switch-logic.h

 // Copyright 2016 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_WASM_SWITCH_LOGIC_H
 #define V8_WASM_SWITCH_LOGIC_H
 
-#include "src/zone-containers.h"
-#include "src/zone.h"
+#include "src/zone/zone-containers.h"
+#include "src/zone/zone.h"
 
 namespace v8 {
 namespace internal {
 namespace wasm {
 
 struct CaseNode : public ZoneObject {
   const int begin;
   const int end;
   CaseNode* left;
   CaseNode* right;
   CaseNode(int begin, int end) : begin(begin), end(end) {
     left = nullptr;
     right = nullptr;
   }
 };
 
 CaseNode* OrderCases(ZoneVector<int>* cases, Zone* zone);
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif