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

test/mjsunit/wasm/module-memory.js

Index: test/mjsunit/wasm/module-memory.js
diff --git a/test/mjsunit/wasm/module-memory.js b/test/mjsunit/wasm/module-memory.js
index e9c1404a4f0bd70933d84962965a159a34104cf2..b3a3a226e545a4630d49e198b54960023ce870a1 100644
--- a/test/mjsunit/wasm/module-memory.js
+++ b/test/mjsunit/wasm/module-memory.js
@@ -10,9 +10,9 @@ 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
@@ -133,9 +133,9 @@ 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