[vm, compiler] Fix GuardFieldTypeInstr to update the original field. Change-Id: I698b6f3315e76f6d491f514333cf38e035ad6e79 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/95423 Reviewed-by: Alexander Markov <alexmarkov@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
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