[Bug ipa/65059] New: [5 Regression] Chrome LTO: lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65059

            Bug ID: 65059
           Summary: [5 Regression] Chrome LTO: lto1: internal compiler
                    error: in ipa_comdats, at ipa-comdats.c:360
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org

Latest GCC produces ICE in:

lto1: internal compiler error: in ipa_comdats, at ipa-comdats.c:360
0xe58435 ipa_comdats
    ../../gcc/ipa-comdats.c:360
0xe585be execute
    ../../gcc/ipa-comdats.c:414

Problematic symbol:
_ZThn8_NK12_GLOBAL__N_116PanelStackWindow9GetWidgetEv/94300622
(_ZThn8_NK12_GLOBAL__N_116PanelStackWindow9GetWidgetEv) @0x7f557e1927a8
  Type: function definition analyzed
  Visibility: prevailing_def_ironly virtual artificial
  References: 
  Referring: 
  Read from file:
obj/chrome/browser/ui/views/panels/browser_ui.panel_stack_view.o
  Availability: available
  First run: 0
  Function flags:
  Thunk fixed offset -8 virtual value 0 has virtual offset 0)
  Called by: 
  Calls: *.LTHUNK22/94300621 (1.00 per call) 

If I see ipa-devirt correctly, this symbol should be probably removed as dead
as it has no calls, am I right? How could I debug if the symbol is considered
to be removed?

Thanks,
Martin