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Re: breakage with "[PATCH 1/6] Add FOR_EACH_INSN{_INFO}_{DEFS,USES,EQ_USES}"

The auto-inc-dec.c compilation fix gets us to the next error -- a
runtime failure in the file:

(gdb) run -g -O2 -mlong-double-128 -fbuilding-libgcc
-fno-stack-protector __gcc_bcmp.i
Starting program: /tmp/20140615/gcc/cc1 -g -O2 -mlong-double-128
-fbuilding-libgcc -fno-stack-protector __gcc_bcmp.i
 strtoimax select getdtablesize mode_size_inline mode_nunits_inline
mode_inner_inline __gcc_bcmp
Analyzing compilation unit
Performing interprocedural optimizations
 <*free_lang_data> <visibility> <early_local_cleanups>
<*free_inline_summary> <whole-program> <profile_estimate> <devirt>
<cp> <cdtor> <inline> <pure-const> <static-var> <comdats>Assembling
Program received signal SIGSEGV, Segmentation fault.
0x10276e4c in _ZL14merge_in_blockiP15basic_block_def (max_reg=174,
    bb=0x70001a00) at /nasfarm/edelsohn/src/src/gcc/auto-inc-dec.c:1427
1427                  reg_next_use[DF_REF_REGNO (def)] = NULL;

- David

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