[asmjs] Move switch-logic.h to asmjs/ 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/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