[Bug lto/65844] New: [5 Regression] ICE (verify_cgraph_node failed) on i686-linux-gnu

["doko at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65844

            Bug ID: 65844
           Summary: [5 Regression] ICE (verify_cgraph_node failed) on
                    i686-linux-gnu
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: doko at gcc dot gnu.org

seen with 5.1 rc2 on i686-linux-gnu, works on x86_64, arm, ppc64le, arm64,
powerpc.

building python 3.5 alpha 4 with lto and pgo (using the testsuite to collect
the perf data):

lto1: error: indirect call frequency 1001 does not match BB frequency 1000
bytes_dealloc/5157 (bytes_dealloc) @0xf6b660e4
  Type: function definition analyzed
  Visibility: prevailing_def_ironly
  previous sharing asm name: 57969
  Address is taken.
  References: 
  Referring: PyBytes_Type/5273 (addr)_textiowrapper_writeflush/54957 (addr)
(speculative)code_dealloc/6404 (addr)
(speculative)_io_FileIO___init___impl/53523 (addr)
(speculative)match_dealloc/48926 (addr) (speculative)os_stat/46510 (addr)
(speculative)PyBuffer_Release/59115 (addr) (speculative)bytesio_dealloc/59792
(addr) (speculative)_Pickler_ClearBuffer/39048 (addr)
(speculative)s_dealloc/37732 (addr) (speculative)assemble_free/22984 (addr)
(speculative)code_dealloc/6404 (addr) (speculative)decode_unicode.isra.8/21159
(addr) (speculative)
  Availability: available
  Profile id: 1495503281
  First run: 402
  Function flags: body icf_merged hot
  Called by: 
  Calls: 
   Indirect call(1.00 per call) 
lto1: internal compiler error: verify_cgraph_node failed
0x82a24dc cgraph_node::verify_node()
    ../../src/gcc/cgraph.c:3151
0x8296e88 symtab_node::verify()
    ../../src/gcc/symtab.c:1103
0x82982a4 symtab_node::verify_symtab_nodes()
    ../../src/gcc/symtab.c:1123
0x84cd553 symbol_table::remove_unreachable_nodes(_IO_FILE*)
    ../../src/gcc/ipa.c:686
0x8596895 execute_todo
    ../../src/gcc/passes.c:2025
Please submit a full bug report,
with preprocessed source if appropriate.