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Rationale: This improves JIT and AOT performance of unary minus and also improves constant folding and range analysis on negative constant (viz. x / -3 is often x / - (3)). The SHIFT operator needed some special treatment, since we have to avoid converting a NON-speculative shifts back into a deopt. https://github.com/dart-lang/sdk/issues/34072 Change-Id: I230c9cfda98297f683bbba53688e57c2cc659360 Reviewed-on: https://dart-review.googlesource.com/68434 Reviewed-by: Alexander Markov <alexmarkov@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Commit-Queue: Aart Bik <ajcbik@google.com>