This fix fixes the mutation problem, however it does not fix the double-run
problem afaict. It could be that the operand is indeed a number, but that
the
second operand which used to be a number, is now a string. That would cause
a
deopt due to string->number conversion while trying to save, causing the op
to
be executed twice.
https://codereview.chromium.org/216823005/
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