82f8a10cdb
It is safe for multiple isolates to set their values concurrently. Only growth of the field tables needs to be excluded by the write lock. A storm of such setters are invoked as part of core library initialization during isolate spawning. TEST=ci, tsan Change-Id: I4677e33ee80bb06d261ada2ae9d6b71c94fde611 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/405400 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>