[vm/compiler] fix assert failure on minint64 Rationale: The new modulo optimization assert fails when doing the power-of-two-of-abs test on minint64 (since abs of minint64 is minint64). Note that we could actually optimize this case by masking with maxint64 pattern but since it bails for non-smi masks right now, this fix does the same. https://github.com/dart-lang/sdk/issues/35815 Change-Id: Ic592dad89ff6ffcd84dba9e17d4bccd79dc01f18 Reviewed-on: https://dart-review.googlesource.com/c/91704 Commit-Queue: Aart Bik <ajcbik@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
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