Mark JS public class fields partial in Safari (#6994)
Mark JS public class fields partial in Safari (#6994)

This change marks the support in Safari for public class fields
partial_implementation:true — due to the fact that while Safari does
support public *instance* fields, it does not yet support public
*static* fields. See https://bugs.webkit.org/show_bug.cgi?id=194095

Fixes https://github.com/mdn/browser-compat-data/issues/6875
mdn/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,chrisdavidmills/browser-compat-data