[vm] Prevent try index from clobbering yield index when encoding pc descriptors.
[vm] Prevent try index from clobbering yield index when encoding pc descriptors.

Bug: https://github.com/dart-lang/sdk/issues/39427
Change-Id: I81beb5b269857e486a7374968fe8ac78d72bb16b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/146695
Commit-Queue: Ryan Macnak <d738b7f001baf9789095d7dc549cff6de60b011d@google.com>
Reviewed-by: Alexander Markov <239e774fd29abc1267878f57afe1a8a03e0ca887@google.com>
Reviewed-by: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk