[vm/compiler] Fix bug in unboxed constant spilling Rationale: Subtle but disastrous, spilling unboxed integers in arm64 and x64 would store the value as smi, detected as a nasty off by one error in flutter code. https://github.com/flutter/flutter/issues/23879 https://github.com/dart-lang/sdk/issues/35091 Change-Id: I07d71727de8574ebd7d3ec3610d517d7903972f0 Reviewed-on: https://dart-review.googlesource.com/c/83565 Commit-Queue: Aart Bik <ajcbik@google.com> Reviewed-by: Siva Annamalai <asiva@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Reviewed-by: Vyacheslav Egorov <vegorov@google.com> Reviewed-by: Alexander Markov <alexmarkov@google.com>
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