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Pass index argument to callback of GC_iterate_free_hblks
(fix of commit 952c70947)

Issue #460 (bdwgc).

* allchblk.c (GC_iterate_free_hblks): Change fn argument type from
GC_walk_hblk_fn to GC_walk_free_blk_fn.
* include/gc/gc_mark.h (GC_iterate_free_hblks): Likewise.
* allchblk.c (GC_iterate_free_hblks): Pass i to fn.
* allchblk.c [!NO_DEBUGGING || GC_ASSERTIONS] (add_hb_sz): Add i
argument (as unused).
* allchblk.c [!NO_DEBUGGING] (print_hblkfreelist_item): New static
function (move part of code from GC_print_hblkfreelist).
* allchblk.c [!NO_DEBUGGING] (GC_print_hblkfreelist): Use
GC_iterate_free_hblks(print_hblkfreelist_item); remove i and h local
variables.
* include/gc/gc_mark.h (GC_walk_hblk_fn): Move declaration down (to be
near GC_apply_to_all_blocks).
* include/gc/gc_mark.h (GC_walk_free_blk_fn): New public type.

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