mapping: rewrite loop using seq_info and args.

* eval.c (map_common): Do not extract the arguments as a list.
Do not produce a list of iterator objects. Instead, allocate
an array of seq_iter_t objects on the stack using alloca, and
use these for walking the input lists in parallel. Do not cons
a list of the tuples coming from the lists, but rather store
the tuples into a struct args, also on the stack, and invoke
the function with that. Now, the only heap memory we allocate
is the resulting list being accumulated. In the case of mapdo,
no heap allocation takes place. However, if some of the inputs
are hashes, then hash iterators get allocated in seq_iter_init.
(mapcarv, mappendv, mapdov): Pass self argument to map_common,
needed for seq_iter_init.

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