Turn ArrayPush into a stub specialized on the elements kind and argc.

test/mjsunit/array-push.js

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+// Flags: --allow-natives-syntax
+
 // Check pushes with various number of arguments.
 (function() {
   var a = [];
   for (var i = 0; i < 7; i++) {
     a = [];
 
     assertEquals(0, a.push());
     assertEquals([], a, "after .push()");
 
     assertEquals(1, a.push(1), "length after .push(1)");
@@ skipping 68 matching lines @@
 
 // Test the case of not JSArray receiver.
 // Regression test for custom call generators, see issue 684.
 (function() {
   var x = {__proto__: []};
   for (var i = 0; i < 100; i++) {
     x.push("a");
     assertEquals(i + 1, x.length, i + 'th iteration');
   }
 })();
+
+(function() {
+  function f(a, i) {
+    a.push(i);
+  }
+
+  var a = [1,2,3];
+  a.f = function() { return 10; }
+  f(a, 4);
+  f(a, 5);
+  f(a, 6);
+  f(a, 7);
+  f(a, {});
+  assertEquals(10, a.f());
+})();
+
+(function() {
+  function f(a, i) {
+    a.push(i);
+  }
+
+  var a = [1,2,3];
+  a.f = function() { return 10; }
+  f(a, 4);
+  f(a, 5);
+  f(a, 6);
+  %OptimizeFunctionOnNextCall(f);
+  f(a, 7);
+  f(a, {});
+  assertEquals(10, a.f());
+})();