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

test/mjsunit/wasm/ffi.js

Index: test/mjsunit/wasm/ffi.js
diff --git a/test/mjsunit/wasm/ffi.js b/test/mjsunit/wasm/ffi.js
index 95d655dc6dfdcfbe1746bea3e3e5d4538a72bba4..1cc23210e824dc18c3133f7e8f36746e2169568f 100644
--- a/test/mjsunit/wasm/ffi.js
+++ b/test/mjsunit/wasm/ffi.js
@@ -8,13 +8,13 @@ load("test/mjsunit/wasm/wasm-constants.js");
 
 function testCallFFI(func, check) {
   var kBodySize = 6;
-  var kNameFunOffset = 24 + kBodySize + 1;
+  var kNameFunOffset = kHeaderSize + 24 + kBodySize + 1;
   var kNameMainOffset = kNameFunOffset + 4;
 
   var ffi = new Object();
   ffi.fun = func;
 
-  var data = bytes(
+  var data = bytesWithHeader(
     // signatures
     kDeclSignatures, 1,
     2, kAstI32, kAstF64, kAstF64, // (f64,f64) -> int
@@ -190,7 +190,7 @@ testCallFFI(returnValue(objWithValueOf), checkReturn(198));
 
 function testCallBinopVoid(type, func, check) {
   var kBodySize = 10;
-  var kNameFunOffset = 28 + kBodySize + 1;
+  var kNameFunOffset = kHeaderSize + 28 + kBodySize + 1;
   var kNameMainOffset = kNameFunOffset + 4;
 
   var ffi = new Object();
@@ -209,7 +209,7 @@ function testCallBinopVoid(type, func, check) {
     args_b = arguments[1];
   }
 
-  var data = bytes(
+  var data = bytesWithHeader(
     // -- signatures
     kDeclSignatures, 2,
     2, kAstStmt, type, type,    // (type,type)->void
@@ -283,13 +283,13 @@ testCallBinopVoid(kAstF64);
 
 function testCallPrint() {
   var kBodySize = 10;
-  var kNamePrintOffset = 10 + 7 + 7 + 9 + kBodySize + 1;
+  var kNamePrintOffset = kHeaderSize + 10 + 7 + 7 + 9 + kBodySize + 1;
   var kNameMainOffset = kNamePrintOffset + 6;
 
   var ffi = new Object();
   ffi.print = print;
 
-  var data = bytes(
+  var data = bytesWithHeader(
     // -- signatures
     kDeclSignatures, 2,
     1, kAstStmt, kAstI32,       // i32->void