e44c0b2264
Provides a general way to designate an isolate as a 'system isolate' (formerly known as 'VM internal isolates'). Initial fix for https://github.com/dart-lang/sdk/issues/42875 Change-Id: I8798a3a1c51df1db8008d602f6303df13c958cba Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/158063 Commit-Queue: Ben Konyi <bkonyi@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>