[Bug middle-end/67271] [5/6 Regression] ICE with -O1,2,3 on darwin14.5 x86_64

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67271

--- Comment #2 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
long int labs (long int j);
int
main ()
{
  long *a = "empty";
  int i = 1441516387;
  a[i] = labs (a[i]);
  return 0;
}

$ ./cc1 -quiet q.c -O
q.c: In function ‘main’:
q.c:5:13: warning: initialization from incompatible pointer type
[-Wincompatible-pointer-types]
   long *a = "empty";
             ^
q.c:9:1: internal compiler error: Segmentation fault
 }
 ^
0xd5be56 crash_signal
        /home/marek/src/gcc/gcc/toplev.c:352
0xa11ecf native_encode_string
        /home/marek/src/gcc/gcc/fold-const.c:7095
0xa11fb8 native_encode_expr(tree_node const*, unsigned char*, int, int)
        /home/marek/src/gcc/gcc/fold-const.c:7127
0xa83bac fold_ctor_reference(tree_node*, tree_node*, unsigned long, unsigned
long, tree_node*)
        /home/marek/src/gcc/gcc/gimple-fold.c:5441
0xa841ce fold_const_aggregate_ref_1(tree_node*, tree_node* (*)(tree_node*))
        /home/marek/src/gcc/gcc/gimple-fold.c:5558
0xa81d11 gimple_fold_stmt_to_constant_1(gimple_statement_base*, tree_node*
(*)(tree_node*), tree_node* (*)(tree_node*))
        /home/marek/src/gcc/gcc/gimple-fold.c:5000
0xe9a2af ccp_fold
        /home/marek/src/gcc/gcc/tree-ssa-ccp.c:1218
0xe9cf26 evaluate_stmt
        /home/marek/src/gcc/gcc/tree-ssa-ccp.c:1738
0xe9f241 visit_assignment
        /home/marek/src/gcc/gcc/tree-ssa-ccp.c:2294
0xe9f487 ccp_visit_stmt
        /home/marek/src/gcc/gcc/tree-ssa-ccp.c:2367
0xf47f24 simulate_stmt
        /home/marek/src/gcc/gcc/tree-ssa-propagate.c:339
0xf485cf simulate_block
        /home/marek/src/gcc/gcc/tree-ssa-propagate.c:517
0xf497c6 ssa_propagate(ssa_prop_result (*)(gimple_statement_base*, edge_def**,
tree_node**), ssa_prop_result (*)(gphi*))
        /home/marek/src/gcc/gcc/tree-ssa-propagate.c:934
0xe9f58b do_ssa_ccp
        /home/marek/src/gcc/gcc/tree-ssa-ccp.c:2410
0xe9f646 execute
        /home/marek/src/gcc/gcc/tree-ssa-ccp.c:2443
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