[vm/compiler] Recognize _asyncStackTraceHelper and build special graph if !FLAG_causal_async_stacks
[vm/compiler] Recognize _asyncStackTraceHelper and build special graph if !FLAG_causal_async_stacks

This is a follow-up to [0] necessary due to mixed bytecode compiled code mode.

[0] https://dart-review.googlesource.com/c/sdk/+/110919


Issue https://github.com/dart-lang/sdk/issues/37668
Closes https://github.com/dart-lang/sdk/issues/37702

Change-Id: If3ac86224644bf02160722ff23eac0c30dbd4697
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111641
Reviewed-by: Teagan Strickland <cce218d042444252b7ac446d60910fca7732559c@google.com>
Auto-Submit: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>
Commit-Queue: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>

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