Fix f.apply() optimization when declared arguments are mutated.

test/mjsunit/regress/regress-2539.js

Index: test/mjsunit/regress/regress-2539.js
diff --git a/test/mjsunit/regress/regress-2489.js b/test/mjsunit/regress/regress-2539.js
similarity index 80%
copy from test/mjsunit/regress/regress-2489.js
copy to test/mjsunit/regress/regress-2539.js
index 882c4f794a88e24d1d64e86a466b27c39f51e625..5d263f8912bb7f44083d159cfead81ba33a3a3b4 100644
--- a/test/mjsunit/regress/regress-2489.js
+++ b/test/mjsunit/regress/regress-2539.js
@@ -28,23 +28,28 @@
 // Flags: --allow-natives-syntax
 
 "use strict";
+var dispatcher = {};
+dispatcher.func = C;
 
-function f(a, b) {
-  return g("c", "d");
+function A() {
+  B(10, 11);
 }
 
-function g(a, b) {
-  g.constructor.apply(this, arguments);
+function B(x,y) {
+  x = 0; y = 0;
+  dispatcher.func.apply(this, arguments);
+  assertSame(2, arguments.length);
+  assertSame(10, arguments[0]);
+  assertSame(11, arguments[1]);
 }
 
-g.constructor = function(a, b) {
-  assertEquals("c", a);
-  assertEquals("d", b);
+function C(x,y) {
+  assertSame(2, arguments.length);
+  assertSame(10, arguments[0]);
+  assertSame(11, arguments[1]);
 }
 
-f("a", "b");
-f("a", "b");
-%OptimizeFunctionOnNextCall(f);
-f("a", "b");
-g.x = "deopt";
-f("a", "b");
+A();
+A();
+%OptimizeFunctionOnNextCall(A);
+A();