Decouple descriptor compute from object alloc in calloc_explicitly_typed

(refactoring)

This is a preparation for providing ability to the client to compute
(and allocate) the internal descriptor of GC_calloc_explicitly_typed
once (for the given object layout and elements count) and perform
the typed allocation multiple times.

* typd_mlc.c (GC_calloc_typed_descr_s): New struct type.
* typd_mlc.c (GC_calloc_prepare_explicitly_typed,
GC_calloc_do_explicitly_typed): New static function (move part of code
from GC_calloc_explicitly_typed); use GC_calloc_typed_descr_s to pass
leaf, simple_d, complex_d, alloc_lb, descr_type values between two
functions; set and use alloc_lb instead of updating lb local variable.
* typd_mlc.c (GC_calloc_explicitly_typed): Use
GC_calloc_prepare_explicitly_typed and GC_calloc_do_explicitly_typed.
* typd_mlc.c (GC_array_mark_proc): Update comment.

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