[Bug bootstrap/63545] ICE building GCC hash_table<cselib_hasher,xcallocator>::find_slot_with_hash

[bill.klees at teamquest dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63545

--- Comment #4 from Bill Klees <bill.klees at teamquest dot com> ---
Much simpler test case
----------------------
struct DWstruct { int high, low; };

typedef union
{
        struct DWstruct s;
        int ll;
} DWunion;

int
__multi3(int u, int v)
{
const DWunion uu = { .ll = u };
return 0;
}


Build Line:
-----------
/u/scratch/users/b/gcc/hp/gcc491_debug/./gcc/xgcc
-B/u/scratch/users/b/gcc/hp/gcc491_debug/./gcc/
-B/shares/source/itlinks/opt/hpux_ia64/11.2/32/gcc-4.9.1/ia64-hp-hpux11.23/bin/
-mlp64 -g -O2 -o _muldi3.o -c test2.c


Traceback of failure
--------------------
#0  0x5830880 in <unknown_procedure> ()
warning: Attempting to unwind past bad PC 0x5830880
#1  0x555be50 in hash_table<cselib_hasher,xcallocator>::find_slot_with_hash (
    this=Unhandled dwarf expression opcode
)
#2  0x4501220:0 in _ZL16cselib_find_slotP7rtx_defj13insert_option12machine_mode
    (x=Unhandled dwarf expression opcode
)
#3  0x45013a0:0 in cselib_lookup (x=Unhandled dwarf expression opcode
)
#4  0x50aa630:0 in _ZL8use_typeP7rtx_defP14count_use_infoP12machine_mode
(loc=Unhandled dwarf expression opcode
)
#5  0x50aaa70:0 in _ZL8add_usesPP7rtx_defPv (ploc=Unhandled dwarf expression
opcode
)
#6  0x4aeac10:0 in for_each_rtx (x=Unhandled dwarf expression opcode
)
#7  0x50a6070:0 in _ZL10add_uses_1PP7rtx_defPv (x=0x76f8b6f8, cui=0x7fffc680)
#8  0x4ae4bf0:0 in note_uses (pbody=Unhandled dwarf expression opcode
)
#9  0x50abfb0:0 in _ZL13add_with_setsP7rtx_defP10cselib_seti (insn=Unhandled
dwarf expression opcode
)
#10 0x4506080:0 in _ZL18cselib_record_setsP7rtx_def (insn=0x76f8b6e0)
#11 0x450a3d0:0 in cselib_process_insn (insn=Unhandled dwarf expression opcode
)
#12 0x50b8980:0 in _ZL13vt_initializev ()
#13 0x50d6840:0 in variable_tracking_main ()
#14 0x511f1c0:0 in _ZL10ia64_reorgv ()
#15 0x4adbe50:0 in _GLOBAL__N_1::pass_machine_reorg::execute (this=0x49fe960:0)
    at /shares/scratch/users/b/gcc/hp/gcc-4.9.1/./gcc/reorg.c:3936
#16 0x49fe960:0 in execute_one_pass (pass=Unhandled dwarf expression opcode
)
#17 0x49ff4a0:0 in execute_pass_list (pass=0x4027c610)
#18 0x49ff500:0 in execute_pass_list (pass=0x4027bd50)
#19 0x49ff500:0 in execute_pass_list (pass=0x4027aed0)
---Type <return> to continue, or q <return> to quit---
#20 0x44de270:0 in _ZL15expand_functionP11cgraph_node (node=Unhandled dwarf
expression opcode
)
#21 0x44e3800:0 in compile ()
#22 0x44e4060:0 in finalize_compilation_unit ()
#23 0x4265f90:0 in c_write_global_declarations ()
#24 0x4bb8680:0 in _ZL12compile_filev ()
#25 0x4bbdb30:0 in toplev_main (argc=23, argv=0x7ffff5b8)
#26 0x5431a70:0 in main (argc=23, argv=0x7ffff5b8)
    at /shares/scratch/users/b/gcc/hp/gcc-4.9.1/./gcc/main.c:37