[wasm] Freeze exports object

test/mjsunit/wasm/add-getters.js

Index: test/mjsunit/wasm/add-getters.js
diff --git a/test/mjsunit/wasm/add-getters.js b/test/mjsunit/wasm/add-getters.js
index 029f58f11bfec05c74668aeee4e1d27362554308..ca5783a7f97d4642fb6b612bd2442ec1a4890561 100644
--- a/test/mjsunit/wasm/add-getters.js
+++ b/test/mjsunit/wasm/add-getters.js
@@ -12,6 +12,13 @@ function testAddGetter(object, name, val) {
   assertSame(val, object[name]);
 }
 
+function testAddGetterFails(object, name, val) {
+  function assign() {
+    Object.defineProperty(object, name, { get: function() { return val; } });
+  }
+  assertThrows(assign, TypeError);
+}
+
 function testAddGetterBothWays(object, name, val) {
   print("Object.defineProperty");
   Object.defineProperty(object, name, { get: function() { return val; } });
@@ -64,5 +71,5 @@ function makeBuilder() {
   var builder = makeBuilder();
   var exports = builder.instantiate().exports;
   testFailToAddGetter(exports, "f", 9834);
-  testAddGetter(exports, "nag", new Number(2));
+  testAddGetterFails(exports, "nag", new Number(2));
 })();