Refactor JSON.parse

[raskad]

Fixes the new test failure from #1528.

It changes the following:

• Refactor JSON.parse

[raskad]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	80,804	80,804	0
Passed	33,162	33,172	+10
Ignored	15,896	15,896	0
Failed	31,746	31,736	-10
Panics	0	0	0
Conformance	41.04%	41.05%	+0.01%

Fixed tests (10):

test/built-ins/JSON/parse/reviver-get-name-err.js [strict mode] (previously Failed)
test/built-ins/JSON/parse/reviver-get-name-err.js (previously Failed)
test/built-ins/JSON/parse/reviver-object-non-configurable-prop-delete.js [strict mode] (previously Failed)
test/built-ins/JSON/parse/reviver-object-non-configurable-prop-delete.js (previously Failed)
test/built-ins/JSON/parse/reviver-object-non-configurable-prop-create.js [strict mode] (previously Failed)
test/built-ins/JSON/parse/reviver-object-non-configurable-prop-create.js (previously Failed)
test/built-ins/JSON/parse/reviver-call-order.js [strict mode] (previously Failed)
test/built-ins/JSON/parse/reviver-call-order.js (previously Failed)
test/built-ins/JSON/parse/reviver-array-get-prop-from-prototype.js [strict mode] (previously Failed)
test/built-ins/JSON/parse/reviver-array-get-prop-from-prototype.js (previously Failed)

[jedel1043]

Everything looks good. Good work!

[HalidOdat]

Looks good to me! :)

[HalidOdat]

Just needs a rebase.