[Bug c++/60553] segfault in gt_ggc_mx_lang_tree_node in Chromium with LTO

["marxin.liska at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60553

--- Comment #10 from Martin LiÅka <marxin.liska at gmail dot com> ---
Second part of suggested patch is sufficient.

ps auxf:
marxin   20293  0.0  0.0   8604  1200 pts/0    S    17:27   0:00  |       \_
c++ -Wl,-z,now -Wl,-z,relro -pthread -Wl,-z,noexecstack -fPIC -pie -L.
-Wl,-uIsHeapProfilerRunning,-uProfilerStart
-Wl,-u_Z21InitialMallocHook_NewPKvj,-u_Z22Init
marxin   20294  0.0  0.0   8128   692 pts/0    S    17:27   0:00  |          
\_
/home/marxin/Programming/bin/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/collect2
-plugin /home/marxin/Programming/bin/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.
marxin   20295  1.1  7.2 3881556 1181360 pts/0 S    17:27   0:03  |            
  \_
/home/marxin/Programming/bin/gcc/lib64/gcc/x86_64-unknown-linux-gnu/4.9.0/../../../../x86_64-unknown-linux-gnu/bin/ld
-plugin /home/marxin/Programming/bi
marxin   20412  0.0  0.1  34448 27212 pts/0    S    17:28   0:00  |            
      \_
/home/marxin/Programming/bin/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
@/tmp/ccw1zmZQ
marxin   20413  0.0  0.0  12060  4548 pts/0    S    17:28   0:00  |            
          \_ c++ @/tmp/ccH68rYD.args
marxin   20414 23.7 33.4 5533676 5489912 pts/0 t    17:28   0:54  |            
              \_
/home/marxin/Programming/bin/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/lto1
-quiet -dumpdir ./ -dumpbase chrome.wpa -mtune=generic -march=x8

ps ax | grep 20414:
20414 pts/0    t      0:54
/home/marxin/Programming/bin/gcc/lib/gcc/x86_64-unknown-linux-gnu/4.9.0/lto1
-quiet -dumpdir ./ -dumpbase chrome.wpa -mtune=generic -march=x86-64 -msse2
-mssse3 -msse -mmmx -m64 -mtune=generic -march=x86-64 -auxbase
chrome_initial.chrome_exe_main_aura -O3 -fno-trapv -fno-exceptions -fPIC
-fno-fat-lto-objects -fltrans-output-list=/tmp/ccqDrHsV.ltrans.out -fwpa=9
-fresolution=/tmp/ccufR16A.res @/tmp/cc13JyyZ

GDB:
#1409777 0x00000000006b3b11 in gt_ggc_m_P9tree_node4htab (x_p=0x7f0f55752850)
at gtype-desc.c:3185
(gdb) p *x
$2 = {hash_f = 0x75a1f0 <libfunc_decl_hash(void const*)>, eq_f = 0x75a200
<libfunc_decl_eq(void const*, void const*)>, del_f = 0x0, entries =
0x7f0f54390a00, size = 61, n_elements = 17, n_deleted = 0, searches = 17,
collisions = 4, 
  alloc_f = 0x681250 <ggc_cleared_alloc_ptr_array_two_args(unsigned long,
unsigned long)>, free_f = 0x549db0 <ggc_free(void*)>, alloc_arg = 0x0,
alloc_with_arg_f = 0x0, free_with_arg_f = 0x0, size_prime_index = 3}
down iterations:
(gdb) p x->generic->base->code
$7 = FUNCTION_DECL
$8 = FUNCTION_TYPE
$9 = INTEGER_TYPE
$10 = INTEGER_CST
$11 = INTEGER_TYPE
$12 = INTEGER_CST
$13 = INTEGER_TYPE
$14 = POINTER_TYPE
$15 = POINTER_TYPE
$16 = POINTER_TYPE
$17 = POINTER_TYPE
$18 = POINTER_TYPE
$19 = INTEGER_TYPE

Hope it will help.
Martin