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

src/v8natives.js

Index: src/v8natives.js
===================================================================
--- src/v8natives.js	(revision 9034)
+++ src/v8natives.js	(working copy)
@@ -55,6 +55,13 @@
     var f = functions[i + 1];
     %FunctionSetName(f, key);
     %FunctionRemovePrototype(f);
+    %IgnoreAttributesAndSetProperty(f, "caller",

[Lasse Reichstein, 2011/09/01 08:23:49]

Add comment that we don't match Safari, but we do match Firefox (and possibly
IE).

+                                    null,
+                                    DONT_ENUM | DONT_DELETE);
+    %IgnoreAttributesAndSetProperty(f, "arguments",
+                                    null,
+                                    DONT_ENUM | DONT_DELETE);
+

[Lasse Reichstein, 2011/09/01 08:23:49]

Add a test that this works? E.g., 
[1].map(function() { assertEquals(null, [].map.caller); assertEquals(null,
[].map.arguments); }

     %SetProperty(object, key, f, attributes);
     %SetNativeFlag(f);
   }