bug#17713: First portion of `bt full`

[Geoff Shannon]

#0  0x0000000000542e54 in mark_object (arg=<optimized out>) at alloc.c:5979
        obj = 5624
        cdr_count = 0
#1  0x00000000005438ae in mark_vectorlike (ptr=0x60e8a68) at alloc.c:5842
        size = 10
        i = <optimized out>
#2  0x00000000005430f2 in mark_object (arg=<optimized out>) at alloc.c:6174
        pvectype = <optimized out>
        obj = <optimized out>
        cdr_count = <optimized out>
#3  0x0000000000543109 in mark_object (arg=<optimized out>) at alloc.c:6301
        obj = 61756006
        cdr_count = 696
#4  0x000000000054317c in mark_object (arg=<optimized out>) at alloc.c:6192
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 49182466
        cdr_count = 0
#5  0x00000000005438ae in mark_vectorlike (ptr=0x11e0130) at alloc.c:5842
        size = 4
        i = <optimized out>
#6  0x00000000005430f2 in mark_object (arg=<optimized out>) at alloc.c:6174
        pvectype = <optimized out>
        obj = <optimized out>
        cdr_count = <optimized out>
#7  0x000000000054302c in mark_object (arg=<optimized out>) at alloc.c:6188
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 49322402
        cdr_count = 0
#8  0x00000000005438ae in mark_vectorlike (ptr=0x32eec98) at alloc.c:5842
        size = 89
        i = <optimized out>
#9  0x00000000005430f2 in mark_object (arg=<optimized out>) at alloc.c:6174
        pvectype = <optimized out>
        obj = <optimized out>
        cdr_count = <optimized out>
#10 0x000000000054302c in mark_object (arg=<optimized out>) at alloc.c:6188
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 53411570
        cdr_count = 0
#11 0x0000000000543109 in mark_object (arg=<optimized out>) at alloc.c:6301
        obj = 54230182
        cdr_count = 3
#12 0x00000000005432a4 in mark_object (arg=<optimized out>) at alloc.c:6088
        size = 6
        i = <optimized out>
        pvectype = <optimized out>
        obj = 54286669
        cdr_count = 0
#13 0x000000000054302c in mark_object (arg=<optimized out>) at alloc.c:6188
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 16847682
        cdr_count = 0
#14 0x0000000000543109 in mark_object (arg=<optimized out>) at alloc.c:6301
        obj = 63191814
        cdr_count = 8
#15 0x0000000000543109 in mark_object (arg=<optimized out>) at alloc.c:6301
        obj = 63191958
        cdr_count = 1
#16 0x0000000000543035 in mark_object (arg=<optimized out>) at alloc.c:6189
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 12289890
        cdr_count = 0
#17 0x00000000005432a4 in mark_object (arg=<optimized out>) at alloc.c:6088
        size = 5
        i = <optimized out>
        pvectype = <optimized out>
        obj = 75274597
        cdr_count = 0
#18 0x000000000054302c in mark_object (arg=<optimized out>) at alloc.c:6188
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 93873106
        cdr_count = 0
#19 0x000000000054317c in mark_object (arg=<optimized out>) at alloc.c:6192
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 92840306
        cdr_count = 0
#20 0x00000000005438ae in mark_vectorlike (ptr=0x4ffd358) at alloc.c:5842
        size = 8
        i = <optimized out>
#21 0x00000000005430f2 in mark_object (arg=<optimized out>) at alloc.c:6174
        pvectype = <optimized out>
        obj = <optimized out>
        cdr_count = <optimized out>
#22 0x000000000054302c in mark_object (arg=<optimized out>) at alloc.c:6188
        ptr = <optimized out>
        ptrx = <optimized out>
        obj = 92840690
        cdr_count = 0
#23 0x0000000000543109 in mark_object (arg=<optimized out>) at alloc.c:6301
        obj = 61495094
        cdr_count = 3
#24 0x00000000005432a4 in mark_object (arg=<optimized out>) at alloc.c:6088
        size = 5
        i = <optimized out>
        pvectype = <optimized out>
        obj = 18854933
        cdr_count = 0