[whatwg/url] IPv4 in IPv6 cleanup (#292)

Changes:

1. Moves _ipv4Piece_ verification step right after the _ipv4Piece_ calculation. Because if the "_ipv4Piece_ > 255" verification returns failure, then no need to increase _pointer_.

2. Moves the last (8.) step to the outside of 6.5.5 loop. This lets drop `c is the EOF` check in this moved step, because loop stops on `EOF`. This obviously gives a better performance.

These changes are based on https://github.com/nodejs/node/pull/12315#discussion_r110858300 and https://github.com/nodejs/node/pull/12315#discussion_r110879264
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/url/pull/292

-- Commit Summary --

  * IPv4 in IPv6 cleanup

-- File Changes --

    M url.bs (9)

-- Patch Links --

https://github.com/whatwg/url/pull/292.patch
https://github.com/whatwg/url/pull/292.diff

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