[wasm] Use the JavaScript WasmModuleBuilder utility in JS tests.

test/mjsunit/wasm/wasm-constants.js

 // Copyright 2015 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.
 
 // Flags: --expose-wasm
 
 function bytes() {
   var buffer = new ArrayBuffer(arguments.length);
   var view = new Uint8Array(buffer);
   for (var i = 0; i < arguments.length; i++) {
     var val = arguments[i];
     if ((typeof val) == "string") val = val.charCodeAt(0);
     view[i] = val | 0;
   }
   return buffer;
 }
 
 // Header declaration constants
 var kWasmH0 = 0;
 var kWasmH1 = 0x61;
 var kWasmH2 = 0x73;
 var kWasmH3 = 0x6d;
 
 var kWasmV0 = 10;
 var kWasmV1 = 0;
 var kWasmV2 = 0;
 var kWasmV3 = 0;
 
 var kHeaderSize = 8;
+var kPageSize = 65536;
 
 function bytesWithHeader() {
   var buffer = new ArrayBuffer(kHeaderSize + arguments.length);
   var view = new Uint8Array(buffer);
   view[0] = kWasmH0;
   view[1] = kWasmH1;
   view[2] = kWasmH2;
   view[3] = kWasmH3;
   view[4] = kWasmV0;
   view[5] = kWasmV1;
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       }
       threwException = false;
     } catch (e) {
       assertEquals("string", typeof e);
       assertEquals(kTrapMsgs[trap], e);
       // Success.
       return;
     }
     throw new MjsUnitAssertionError("Did not trap, expected: " + kTrapMsgs[trap]);
 }