Fix assertion for map code cache of shared maps.

test/mjsunit/compare-known-objects-slow.js

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 // Flags: --allow-natives-syntax
 
-// Test inlining at call sites with mismatched arity.
+// Test CompareIC stubs for normal and strict equality comparison of known
+// objects in slow mode. These objects share the same map even though they
+// might have completely different properties.
 
-function f(a) {
-  return a.x;
+function eq(a, b) {
+  return a == b;
 }
 
-function g(a, b) {
-  return a.x;
+function eq_strict(a, b) {
+  return a === b;
 }
 
-function h1(a, b) {
-  return f(a, a) * g(b);
+function test(a, b) {
+  // Check CompareIC for equality of known objects.
+  assertTrue(eq(a, a));
+  assertTrue(eq(b, b));
+  assertFalse(eq(a, b));
+  // Check CompareIC for strict equality of known objects.
+  assertTrue(eq_strict(a, a));
+  assertTrue(eq_strict(b, b));
+  assertFalse(eq_strict(a, b));
 }
 
-function h2(a, b) {
-  return f(a, a) * g(b);
-}
+// Prepare two objects in slow mode that have the same map.
+var obj1 = %OptimizeObjectForAddingMultipleProperties({}, 1);
+var obj2 = %OptimizeObjectForAddingMultipleProperties({}, 1);
 
+// Test original objects.
+assertTrue(%HaveSameMap(obj1, obj2));
+test(obj1, obj2);
 
-var o = {x: 2};
+// Test after adding property to first object.
+obj1.x = 1;
+assertTrue(%HaveSameMap(obj1, obj2));
+test(obj1, obj2);
 
-assertEquals(4, h1(o, o));
-assertEquals(4, h1(o, o));
-assertEquals(4, h2(o, o));
-assertEquals(4, h2(o, o));
-%OptimizeFunctionOnNextCall(h1);
-%OptimizeFunctionOnNextCall(h2);
-assertEquals(4, h1(o, o));
-assertEquals(4, h2(o, o));
-
-var u = {y:0, x:1};
-assertEquals(2, h1(u, o));
-assertEquals(2, h2(o, u));
+// Test after adding property to second object.
+obj2.y = 2;
+assertTrue(%HaveSameMap(obj1, obj2));
+test(obj1, obj2);