Reviewed by Simon Hausmann.

        QScriptValue::isObject fix.

        Fix broken internal state evaluation from JSValue to JSNative / JSObject.
        New function was introduced which should take care about promoting
        JSValue state inside QScriptValuePrivate. It should be used instead of a
        direct JSC C API call.

        The bug exposed a weakness in autotest suite, as the QScriptValuePrivate
        is based on state machine with lazy state evaluation, there is a possibility
        that serial sequencial calls to the same public const function could return
        different results. The patch fix the issue.

        [Qt] Sometimes QScriptValue::isObject returns an incorrect value
        https://bugs.webkit.org/show_bug.cgi?id=35387

        * qt/api/qscriptvalue_p.h:
        (QScriptValuePrivate::isBool):
        (QScriptValuePrivate::isNumber):
        (QScriptValuePrivate::isNull):
        (QScriptValuePrivate::isString):
        (QScriptValuePrivate::isUndefined):
        (QScriptValuePrivate::isError):
        (QScriptValuePrivate::isObject):
        (QScriptValuePrivate::isFunction):
        (QScriptValuePrivate::call):
        (QScriptValuePrivate::refineJSValue):
        * qt/tests/qscriptvalue/tst_qscriptvalue_generated.cpp:
        (tst_QScriptValue::initScriptValues):
        (tst_QScriptValue::isValid_makeData):
        (tst_QScriptValue::isValid_test):
        (tst_QScriptValue::isBool_makeData):
        (tst_QScriptValue::isBool_test):
        (tst_QScriptValue::isBoolean_makeData):
        (tst_QScriptValue::isBoolean_test):
        (tst_QScriptValue::isNumber_makeData):
        (tst_QScriptValue::isNumber_test):
        (tst_QScriptValue::isFunction_test):
        (tst_QScriptValue::isNull_makeData):
        (tst_QScriptValue::isNull_test):
        (tst_QScriptValue::isString_makeData):
        (tst_QScriptValue::isString_test):
        (tst_QScriptValue::isUndefined_makeData):
        (tst_QScriptValue::isUndefined_test):
        (tst_QScriptValue::isObject_makeData):
        (tst_QScriptValue::isObject_test):
        (tst_QScriptValue::toString_makeData):
        (tst_QScriptValue::toString_test):
        (tst_QScriptValue::toNumber_makeData):
        (tst_QScriptValue::toNumber_test):
        (tst_QScriptValue::toBool_makeData):
        (tst_QScriptValue::toBool_test):
        (tst_QScriptValue::toBoolean_makeData):
        (tst_QScriptValue::toBoolean_test):
        (tst_QScriptValue::toInteger_makeData):
        (tst_QScriptValue::toInteger_test):
        (tst_QScriptValue::toInt32_makeData):
        (tst_QScriptValue::toInt32_test):
        (tst_QScriptValue::toUInt32_makeData):
        (tst_QScriptValue::toUInt32_test):
        (tst_QScriptValue::toUInt16_makeData):
        (tst_QScriptValue::toUInt16_test):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55502 268f45cc-cd09-0410-ab3c-d52691b4dbfc