iter-reset: gc problem.

* lib.c (iter_reset): When we reinitialize the iterator, it can allocate
a new secondary object, e.g. using hash_begin, which is stored into the
iterator. This is potentially a wrong-way assignment in terms of GC
generations and so we must call mut(iter) to indicate that the object
has been suspiciously mutated. We only do this if the iterator has a
mark function. If it doesn't have one, then it isn't wrapping a heap
object, and so doesn't have this issue.
(seq_reset): This has the same issue, and the fix is the same. Since ths
function is obsolescent, we don't bother doing the si->ops->mark check;
we optimize for code size instead.

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