Properly handle NaN in new Date()

[raskad]

This Pull Request fixes/closes #1476.

It changes the following:

• Properly handle NaN in new Date()

[raskad]

Test262 conformance changes:

Test result	master count	PR count	difference
Total	78,897	78,897	0
Passed	29,766	29,824	+58
Ignored	15,612	15,612	0
Failed	33,519	33,461	-58
Panics	2	2	0
Conformance	37.73%	37.80%	+0.07%

Fixed tests:

test/built-ins/Date/value-to-primitive-result-non-string-prim.js [strict mode] (previously Failed)
test/built-ins/Date/value-to-primitive-result-non-string-prim.js (previously Failed)
test/built-ins/Date/prototype/getUTCMilliseconds/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCMilliseconds/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getDay/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getDay/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCFullYear/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCFullYear/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/setMilliseconds/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/setMilliseconds/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCMonth/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCMonth/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getFullYear/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getFullYear/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/setMonth/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/setMonth/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/setSeconds/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/setSeconds/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getHours/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getHours/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/toUTCString/invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/toUTCString/invalid-date.js (previously Failed)
test/built-ins/Date/prototype/toTimeString/invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/toTimeString/invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getMinutes/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getMinutes/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCDay/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCDay/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getTime/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getTime/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getDate/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getDate/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCMinutes/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCMinutes/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/valueOf/S9.4_A3_T2.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/valueOf/S9.4_A3_T2.js (previously Failed)
test/built-ins/Date/prototype/getSeconds/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getSeconds/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getMonth/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getMonth/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCDate/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCDate/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCHours/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCHours/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/toDateString/invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/toDateString/invalid-date.js (previously Failed)
test/built-ins/Date/prototype/setDate/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/setDate/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getUTCSeconds/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getUTCSeconds/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/toString/invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/toString/invalid-date.js (previously Failed)
test/built-ins/Date/prototype/getMilliseconds/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/getMilliseconds/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/setMinutes/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/setMinutes/this-value-invalid-date.js (previously Failed)
test/built-ins/Date/prototype/setHours/this-value-invalid-date.js [strict mode] (previously Failed)
test/built-ins/Date/prototype/setHours/this-value-invalid-date.js (previously Failed)