Move object literal checking into checker classes

test/mjsunit/object-literal-multiple-proto-fields.js

Index: test/mjsunit/object-literal-multiple-proto-fields.js
diff --git a/test/mjsunit/object-literal-multiple-proto-fields.js b/test/mjsunit/object-literal-multiple-proto-fields.js
index d8822c97c1b32a416a37e545521183d1e0fa9feb..1ab608bde2c451bf06ec396e51bf056c2ec56aca 100644
--- a/test/mjsunit/object-literal-multiple-proto-fields.js
+++ b/test/mjsunit/object-literal-multiple-proto-fields.js
@@ -6,14 +6,16 @@ var p1 = {};
 var p2 = {};
 var p3 = {};
 var x = 0;
-var y = 0;
-var z = 0;
-var o = {
-  __proto__: (x++, p1),
-  __proto__: (y++, p2),
-  __proto__: (z++, p3)
-};
-assertEquals(1, x);
+var y = 1;
+var z = 2;
+var o = 3;
+assertThrows(
+    'o = {' +
+    '  __proto__: (x++, p1),' +
+    '  __proto__: (y++, p2),' +
+    '  __proto__: (z++, p3)' +
+    '};', SyntaxError);
+assertEquals(0, x);
 assertEquals(1, y);
-assertEquals(1, z);
-assertEquals(Object.getPrototypeOf(o), p3);
+assertEquals(2, z);
+assertEquals(3, o);