[ES6] Object type restrictions on a first parameter of several Object.* functions...

[ES6] Object type restrictions on a first parameter of several Object.* functions are relaxed
https://bugs.webkit.org/show_bug.cgi?id=142937

Reviewed by Darin Adler.

Source/JavaScriptCore:

In ES6, Object type restrictions on a first parameter of several Object.* functions are relaxed.
In ES5 or prior, when a first parameter is not object type, these functions raise TypeError.
But now, several functions perform ToObject onto a non-object parameter.
And others behaves as if a parameter is a non-extensible ordinary object with no own properties.
It is described in ES6 Annex E.
Functions different from ES5 are following.

1. An attempt is make to coerce the argument using ToObject.
    Object.getOwnPropertyDescriptor
    Object.getOwnPropertyNames
    Object.getPrototypeOf
    Object.keys

2. Treated as if it was a non-extensible ordinary object with no own properties.
    Object.freeze
    Object.isExtensible
    Object.isFrozen
    Object.isSealed
    Object.preventExtensions
    Object.seal

* runtime/ObjectConstructor.cpp:
(JSC::ObjectConstructorGetPrototypeOfFunctor::operator()):
(JSC::objectConstructorGetPrototypeOf):
(JSC::objectConstructorGetOwnPropertyDescriptor):
(JSC::objectConstructorGetOwnPropertyNames):
(JSC::objectConstructorKeys):
(JSC::objectConstructorSeal):
(JSC::objectConstructorFreeze):
(JSC::objectConstructorPreventExtensions):
(JSC::objectConstructorIsSealed):
(JSC::objectConstructorIsFrozen):
(JSC::objectConstructorIsExtensible):
* tests/stress/object-freeze-accept-non-object.js: Added.
* tests/stress/object-get-own-property-descriptor-perform-to-object.js: Added.
(canary):
* tests/stress/object-get-own-property-names-perform-to-object.js: Added.
(compare):
* tests/stress/object-get-prototype-of-perform-to-object.js: Added.
* tests/stress/object-is-extensible-accept-non-object.js: Added.
* tests/stress/object-is-frozen-accept-non-object.js: Added.
* tests/stress/object-is-sealed-accept-non-object.js: Added.
* tests/stress/object-keys-perform-to-object.js: Added.
(compare):
* tests/stress/object-prevent-extensions-accept-non-object.js: Added.
* tests/stress/object-seal-accept-non-object.js: Added.

LayoutTests:

Several LayoutTests are updated with the new behavior.
Test cases in IETestCenter contain test for the outdated behavior.
But IETestCenter is brought from the external source, so instead of modifying it,
we mark them as Failure in TestExpectations.

* TestExpectations:
* js/dom/getOwnPropertyDescriptor-expected.txt:
* js/prototypes-expected.txt:
* js/resources/getOwnPropertyDescriptor.js:
* js/script-tests/prototypes.js:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182189 268f45cc-cd09-0410-ab3c-d52691b4dbfc