ObjectPrototype: Improve ES6 compliance

* getPrototypeOf: Per 19.1.2.9, we should ToObject(O), and ReturnIfAbrupt
* getOwnPropertyDescriptor: Per 19.1.2.6, we should ToObject(O), and ReturnIfAbrupt
* getOwnPropertyNames: Per 19.1.2.8.1, we should ToObject(O) and ReturnIfAbrupt
* seal: Per 1.9.2.17, if Type(O) is not Object, return O
* freeze: Per 1.9.2.5, if Type(O) is not Object, return O
* preventExtensions: Per 19.1.2.15, if Type(O) is not Object, return O
* isSealed: Per 19.1.2.13, if Type(O) is not Object, return true
* isFrozen: Per 19.1.2.12, if Type(O) is not Object, return true
* isExtensible: Per 19.1.2.11, if Type(O) is not Object, return false
* keys: Per 19.1.2.14, we should ToObject(O), and ReturnIfAbrupt

This improves the ES6 passrate for test/built-ins/Object/ quite a bit, before:
    === Summary ===
     - Ran 6144 tests
     - Passed 5719 tests (93.1%)
     - Failed 425 tests (6.9%)

After:
    === Summary ===
     - Ran 6144 tests
     - Passed 5769 tests (93.9%)
     - Failed 375 tests (6.1%)

... and also fixes numerous tests in other areas. Most of the missing
failures seem to be down to missing Object.assign & Symbol. It does regress on
some ES5 tests that specifically check for the ES5 spec behavior.

Change-Id: I039a223060c79c5bf4f5b041ad1ec4dc1afd5932
Reviewed-by: Simon Hausmann <[email protected]>

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