[vm/concurrency] Fix user-after-free when running experimental --enable-isolate-groups in JIT with app-jit training Originally I had the permutation map on IsolateGroup where the copy was needed due to creating the temporary spawn group. Though it moved to IsolateGroupSource now which is shared even with the temporary spawn group. This fixes flakiness in the app-jit tests: tools/test.py -n app_jitk-linux-release-x64 standalone_2/typed_array_test/0 Fixes https://github.com/dart-lang/sdk/issues/40750 Change-Id: I0611fc98d03950b400ef70fa5127eba9d00742bc Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/137304 Reviewed-by: Alexander Aprelev <aam@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Martin Kustermann <kustermann@google.com>
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