https://bugs.webkit.org/show_bug.cgi?id=79331

Reviewed by Sam Weinig.

Need to inspect all properties, including static ones.
This exposes a couple of bugs in Array & Arguments:
    - getOwnPropertyDescriptor doesn't correctly report the writable attribute of array length.
    - Arguments object's defineOwnProperty does not handle callee/caller/length correctly.

Source/JavaScriptCore: 

* runtime/Arguments.cpp:
(JSC::Arguments::defineOwnProperty):
    - Add handling for callee/caller/length.
* runtime/JSArray.cpp:
(JSC::JSArray::getOwnPropertyDescriptor):
    - report length's writability correctly.
* runtime/ObjectConstructor.cpp:
(JSC::objectConstructorSeal):
(JSC::objectConstructorFreeze):
(JSC::objectConstructorIsSealed):
(JSC::objectConstructorIsFrozen):
    - Add spec-based implementation for non-final objects.

LayoutTests: 

* fast/js/preventExtensions-expected.txt:
* fast/js/script-tests/preventExtensions.js:
    - Added tests.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108651 268f45cc-cd09-0410-ab3c-d52691b4dbfc