Make arguments and caller always be null on native functions (fixes issue 1548 and issue 1643).

test/mjsunit/regress/regress-1548.js

+// Copyright 2011 the V8 project authors. All rights reserved.
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+// modification, are permitted provided that the following conditions are
+// met:
+//
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+
+// Test that the caller and arguments objects are not available on native
+// functions.
+
+function testfn(f) { return [1].map(f)[0]; }
+function foo() { return [].map.caller; }
+assertEquals(null, testfn(foo));
+
+// Try to delete the caller property (to make sure that we can't get to the
+// caller accessor on the prototype.
+delete Array.prototype.map.caller;
+assertEquals(null, testfn(foo));