Most lists created when loading a dill file are growable.
That's not always needed, though, and a non-growable list is more compact than
a growable one.
When running dart2js in its "linker scenario" on a large internal app
this saves something along the lines of 90MB of memory.
Change-Id: I113a73ed150efb56a5172ac7e1daf1d28f4bc188
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/185825
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Reviewed-by: Stephen Adams <sra@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>
Jens Johansen
433d59b917