[heycam/webidl] [Clamp] and [EnforceRange] reduce the max value long long supports (#237)

[`long long`](https://heycam.github.io/webidl/#es-long-long) and [`unsigned long long`](https://heycam.github.io/webidl/#es-unsigned-long-long) behave differently when used in conjunction with [Clamp] or [EnforceRange]. In that case the max supported value is 2^53 – 1. When used without extended attributes, its; 2^64.

Particularly relevant are steps 2.3, 3.1 and 6 of both algorithms.


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