[vm/compiler] Fix incorrect labeling of stack slots Rationale: The "unoptimized code" representation is really a stack machine that pushes and pops arguments. The intermediate representation did not show the correct labeling for "temporaries", in particular around push arguments. This CL fixes that bug, making the human readable form of the intermediate much easier to understand. Also, it allows for proper stack depth computations. First use: Sharpen condition on OSR points a bit. Simple control flow collections will now allow OSR. https://github.com/dart-lang/sdk/issues/36421 https://github.com/dart-lang/sdk/issues/36409 Change-Id: I8be707af08462a22687b355b747ba85e42431ad5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/98500 Commit-Queue: Aart Bik <ajcbik@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
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