[wasm] Add a magic word and a version number to the binary.

test/mjsunit/wasm/module-memory.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 --expose-gc --stress-compaction
 
 load("test/mjsunit/wasm/wasm-constants.js");
 
 var kMemSize = 4096;
 
 function genModule(memory) {
   var kBodySize = 27;
-  var kNameMainOffset = 28 + kBodySize + 1;
+  var kNameMainOffset = kHeaderSize + 28 + kBodySize + 1;
 
-  var data = bytes(
+  var data = bytesWithHeader(
     kDeclMemory,
     12, 12, 1,                  // memory
     // -- signatures
     kDeclSignatures, 1,
     1, kAstI32, kAstI32,        // int->int
     // -- main function
     kDeclFunctions, 1,
     kDeclFunctionLocals | kDeclFunctionName | kDeclFunctionExport,
     0, 0,
     kNameMainOffset, 0, 0, 0,   // name offset
@@ skipping 100 matching lines @@
 }
 
 testOuterMemorySurvivalAcrossGc();
 testOuterMemorySurvivalAcrossGc();
 testOuterMemorySurvivalAcrossGc();
 testOuterMemorySurvivalAcrossGc();
 
 
 function testOOBThrows() {
   var kBodySize = 8;
-  var kNameMainOffset = 29 + kBodySize + 1;
+  var kNameMainOffset = kHeaderSize + 29 + kBodySize + 1;
 
-  var data = bytes(
+  var data = bytesWithHeader(
     kDeclMemory,
     12, 12, 1,                     // memory = 4KB
     // -- signatures
     kDeclSignatures, 1,
     2, kAstI32, kAstI32, kAstI32,  // int->int
     // -- main function
     kDeclFunctions, 1,
     kDeclFunctionLocals | kDeclFunctionName | kDeclFunctionExport,
     0, 0,
     kNameMainOffset, 0, 0, 0,      // name offset
@@ skipping 23 matching lines @@
   }
 
 
   for (offset = 4093; offset < 4124; offset++) {
     assertTraps(kTrapMemOutOfBounds, read);
     assertTraps(kTrapMemOutOfBounds, write);
   }
 }
 
 testOOBThrows();