f3520ff11b
In lightweight isolate mode if some isolate or background compiler decides to deopt unboxed field, we need to bring to stop all other isolates to prevent to-be-deoptimized code from running. If isolates are not stopped they might continue running the code that still assumes the field is unboxed(reusable mutable box), overwriting (now immutable) boxed value. Issue https://github.com/dart-lang/sdk/issues/36097 TEST=ci Change-Id: I5d2492650b8aa00491a1bd6ba2a7fb4817460f14 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/195662 Commit-Queue: Alexander Aprelev <aam@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com>