8026161: Don't narrow floating-point literals in the lexer
Reviewed-by: hannesw, jlaskey
new Date(NaN).setFullYear(NaN) = NaN
new Date(0).setYear(70) = 0
new Date(0).setYear(NaN) = NaN
new Date(NaN).setYear(70) = -19800000
new Date(NaN).getTimezoneOffset() = NaN
Date.prototype.setMilliseconds calls valueOf on arg
Date.prototype.setUTCMilliseconds calls valueOf on arg
Date.prototype.setSeconds calls valueOf on arg
Date.prototype.setUTCSeconds calls valueOf on arg
Date.prototype.setMinutes calls valueOf on arg
Date.prototype.setUTCMinutes calls valueOf on arg
Date.prototype.setHours calls valueOf on arg
Date.prototype.setUTCHours calls valueOf on arg
Date.prototype.setDate calls valueOf on arg
Date.prototype.setUTCDate calls valueOf on arg
Date.prototype.setMonth calls valueOf on arg
Date.prototype.setUTCMonth calls valueOf on arg