bug#10159: 24.0.91; Segfault with auto-complete package [SEC=UNCLASSIFIED]

[Alex Murray <alex.murray@dsto.defence.gov.au>]

Including top lines of stacktrace (see original bug report for the full 
trace) to make this more visible in google etc for others to find:

#0  0x00000000005d3479 in composition_compute_stop_pos 
(cmp_it=0x7fffffff6b08,
     charpos=60, bytepos=70, endpos=<optimized out>, string=45088720)
     at composite.c:1073
         elt = <optimized out>
         ridx = <optimized out>
         start = 0
         end = 6100578
         c = <optimized out>
         prop = 12024322
         val = <optimized out>
#1  0x000000000042e638 in compute_stop_pos (it=0x7fffffff62a0) at 
xdisp.c:3273
         stoppos = <optimized out>
         iv = <optimized out>
         next_iv = <optimized out>
         object = <optimized out>
         limit = <optimized out>
         position = 0
         charpos = 0
         bytepos = 0
#2  0x000000000043a26f in next_element_from_string (it=0x7fffffff62a0)
     at xdisp.c:7304
         position = {charpos = 0, bytepos = 0}
#3  0x000000000043d4ba in get_next_display_element (it=0x7fffffff62a0)
     at xdisp.c:6375
         success_p = <optimized out>
...


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