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As part of making the compiler and various other systems independent of the current isolate, we move state from Isolate to IsolateGroup. There is still follow-up work to do for hot-reloading isolate groups. Issue https://github.com/dart-lang/sdk/issues/36097 TEST=Refactoring of existing code. Change-Id: I4a2cebd06b49696e733adde622217b4de6718260 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/182508 Commit-Queue: Martin Kustermann <kustermann@google.com> Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com>