[Bug middle-end/60418] [4.9 Regression] 435.gromacs in SPEC CPU 2006 is miscompiled

["hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60418

--- Comment #7 from H.J. Lu <hjl.tools at gmail dot com> ---
current_loops is setup by

(gdb) bt
#0  set_loops_for_fn (fn=0x7ffff15901f8, loops=0x7fffef079e20)
    at ../../../../gcc/gcc/function.h:747
#1  0x00000000008fe35e in input_cfg (ib=0x7fffffffdbc0, data_in=0x1fc4a80, 
    fn=0x7ffff15901f8, count_materialization_scale=10000)
    at ../../../../gcc/gcc/lto-streamer-in.c:687
#2  0x00000000008ff088 in input_function (fn_decl=0x7ffff1a6d800, 
    data_in=0x1fc4a80, ib=0x7fffffffdbb0, ib_cfg=0x7fffffffdbc0)
    at ../../../../gcc/gcc/lto-streamer-in.c:935
#3  0x00000000008ff7ca in lto_read_body (file_data=0x7ffff1866000, 
    node=0x7ffff10468f8, data=0x2439810 "\003", 
    section_type=LTO_section_function_body)
    at ../../../../gcc/gcc/lto-streamer-in.c:1081
#4  0x00000000008ffa55 in lto_input_function_body (file_data=0x7ffff1866000, 
    node=0x7ffff10468f8, data=0x2439810 "\003")
    at ../../../../gcc/gcc/lto-streamer-in.c:1123
#5  0x000000000063ea32 in cgraph_get_body (node=0x7ffff10468f8)
    at ../../../../gcc/gcc/cgraph.c:3012
#6  0x00000000006466ad in expand_function (node=0x7ffff10468f8)
    at ../../../../gcc/gcc/cgraphunit.c:1746
#7  0x0000000000646d5e in expand_all_functions ()
    at ../../../../gcc/gcc/cgraphunit.c:1908
#8  0x000000000064772a in compile () at ../../../../gcc/gcc/cgraphunit.c:2252
#9  0x000000000059a615 in lto_main () at ../../../../gcc/gcc/lto/lto.c:3427
---Type <return> to continue, or q <return> to quit---
#10 0x0000000000a53c2c in compile_file () at ../../../../gcc/gcc/toplev.c:548
#11 0x0000000000a55dc3 in do_compile () at ../../../../gcc/gcc/toplev.c:1914
#12 0x0000000000a55f2e in toplev_main (argc=22, argv=0x1ac9810)
    at ../../../../gcc/gcc/toplev.c:1990
#13 0x00000000011ddec4 in main (argc=22, argv=0x7fffffffdef8)
    at ../../../../gcc/gcc/main.c:36

if (current_loops)
{
}

is entered without calling loop_optimizer_init first.