[vm/concurrency] Allow caller of Thread::{Exit,Enter}Isolate to specify nesting
It's mainly hoisting an expression out of
IsolateGroup::{Increase,Decrease}MutatorCount to callers of it.
Right now we consider a Thread::{Exit,Enter} to be nested if there are
existing Dart frames on the stack. A future CL will have a case where
there's a nested exit&re-enter without Dart frames on the stack.
Trying to do this automatically by checking whether there's an
active api scope / zone on the thread fails due to some
asymmetry in our codebase.
Issue https://github.com/dart-lang/sdk/issues/36097
TEST=Refactoring of existing code.
Change-Id: Id70eda03efb2099487c5f0c8affd25ddff926553
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/186287
Commit-Queue: Martin Kustermann <kustermann@google.com>
Reviewed-by: Alexander Aprelev <aam@google.com>
Reviewed-by: Ryan Macnak <rmacnak@google.com>
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