Commits on Jul 9, 2021

1. Cache Intl.DateTimeFormat to reduce memory footprint …

   Creating Intl.DateTimeFormat instances in V8 is very slow and memory heavy.
   GetFormatterParts and GetCanonicalTimeZoneIdentifier are functions that
   are called many times when using Temporal, and they used to create new
   instances of Intl.DateTimeFormat for each call. In this commit, we cache them
   using the time zone identifier as the key.
   
   It should be noted that doing the same to SystemTimeZone was deliberately
   avoided. This is due to the fact that the user's time zone may change during
   the execution of a program. An example is calling Temporal.now.zonedDateTimeISO()
   which should always output the correct time zone. This shouldn't be a problem
   for server-sided code which usually doesn't (or rather, shouldn't) use the
   time zone from the environment for calculations.

   

   ferk6a committed Jul 9, 2021
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