[Bug lto/65995] LTO: ICE in add_symbol_to_partition_1 for debug build

[zerolo at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65995

--- Comment #7 from Daniel Vollmer <zerolo at gmail dot com> ---
Crash still present in gcc 5.3.0.

When compiling with -g I also get plenty of the warnings for pretty much each
and every symbol used in the library / program, e.g.
[snip hundreds more]
warning: (x86_64)  could not find object file symbol for symbol
__ZTVSt23_Sp_counted_ptr_inplaceIN2DX4MeshIdjyLi1ELi1ELi1ELi1EEESaIS2_ELN9__gnu_cxx12_Lock_policyE2EE.lto_priv.301
warning: (x86_64)  could not find object file symbol for symbol
__ZTVSt16_Sp_counted_baseILN9__gnu_cxx12_Lock_policyE2EE.lto_priv.300
warning: (x86_64)  could not find object file symbol for symbol
__ZTVSt23_Sp_counted_ptr_inplaceIN2DX4MeshIdjyLin1ELin1ELin1ELin1EEESaIS2_ELN9__gnu_cxx12_Lock_policyE2EE.lto_priv.328
warning: (x86_64)  could not find object file symbol for symbol
__ZTISt11_Mutex_baseILN9__gnu_cxx12_Lock_policyE2EE
warning: (x86_64)  could not find object file symbol for symbol
__ZTISt16_Sp_counted_baseILN9__gnu_cxx12_Lock_policyE2EE
warning: (x86_64)  failed to insert symbol 'GCC_except_table0' in the debug
map.
warning: (x86_64)  failed to insert symbol 'GCC_except_table1' in the debug
map.
warning: (x86_64)  failed to insert symbol 'GCC_except_table2' in the debug
map.
[snip hundreds more]