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Thread::EnterIsolateAsHelper was removed in https://dart-review.googlesource.com/c/sdk/+/295940, so we now need to pass isolate pointers through more function calls. TEST=Ran pkg/dds/test/get_cached_cpu_samples_test in debug mode, in release mode with TSAN, and in release mode with ASAN. Fixes: https://github.com/dart-lang/sdk/issues/52796 Change-Id: Ib0187fb8551628c7b7606a3a5fa9385d26e097d6 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/321500 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Derek Xu <derekx@google.com>