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

src/asmjs/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"
 
@@ skipping 11 matching lines @@
     right = nullptr;
   }
 };
 
 CaseNode* OrderCases(ZoneVector<int>* cases, Zone* zone);
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif