Add Object.entries tests

.../built-ins/object/entries/exception-during-enumeration.js

...uilt-ins/object/entries/exception-not-object-coercible.js

test/built-ins/object/entries/function-length.js

test/built-ins/object/entries/function-name.js

.../built-ins/object/entries/function-property-descriptor.js

test/built-ins/object/entries/getter-adding-key.js

.../object/entries/getter-making-future-key-nonenumerable.js

test/built-ins/object/entries/getter-removing-future-key.js

.../built-ins/object/entries/inherited-properties-omitted.js

test/built-ins/object/entries/primitive-booleans.js

test/built-ins/object/entries/primitive-numbers.js

test/built-ins/object/entries/primitive-strings.js

test/built-ins/object/entries/primitive-symbols.js

test/built-ins/object/entries/symbols-omitted.js

test/built-ins/object/entries/tamper-with-global-object.js

test/built-ins/object/entries/tamper-with-object-keys.js