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

test/mjsunit/wasm/instantiate-module-basic.js

Index: test/mjsunit/wasm/instantiate-module-basic.js
diff --git a/test/mjsunit/wasm/instantiate-module-basic.js b/test/mjsunit/wasm/instantiate-module-basic.js
index 13a22615fca792f857fe9aa076674a10032ce1d1..fdca92328af597ca8fb8a1a8a867acd0d43a4c22 100644
--- a/test/mjsunit/wasm/instantiate-module-basic.js
+++ b/test/mjsunit/wasm/instantiate-module-basic.js
@@ -9,9 +9,9 @@ load("test/mjsunit/wasm/wasm-constants.js");
 var kReturnValue = 117;
 
 var kBodySize = 2;
-var kNameOffset = 19 + kBodySize + 1;
+var kNameOffset = kHeaderSize + 19 + kBodySize + 1;
 
-var data = bytes(
+var data = bytesWithHeader(
   // -- memory
   kDeclMemory,
   10, 10, 1,