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

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

Index: test/mjsunit/wasm/instantiate-run-basic.js
diff --git a/test/mjsunit/wasm/instantiate-run-basic.js b/test/mjsunit/wasm/instantiate-run-basic.js
index b103e8f4394f64b38cdeac2eea4b95306a3b0804..55e7c6e851319f27cc89d9775848bf1d5eca95ac 100644
--- a/test/mjsunit/wasm/instantiate-run-basic.js
+++ b/test/mjsunit/wasm/instantiate-run-basic.js
@@ -9,9 +9,9 @@ load("test/mjsunit/wasm/wasm-constants.js");
 var kReturnValue = 97;
 
 var kBodySize = 2;
-var kNameOffset = 15 + kBodySize + 1;
+var kNameOffset = kHeaderSize + 15 + kBodySize + 1;
 
-var data = bytes(
+var data = bytesWithHeader(
   // -- signatures
   kDeclSignatures, 1,
   0, kAstI32,                 // signature: void -> int