[Bug c++/60532] New: [4.9 Regression] r208573 causes Firefox build failure

[trippels at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60532

            Bug ID: 60532
           Summary: [4.9 Regression] r208573 causes Firefox build failure
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: jason at gcc dot gnu.org

With --enable-checking=release I get with r208573:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff7e27840 (LWP 12914)]
0x0000000000e3f6d0 in dfs_get_pure_virtuals(tree_node*, void*) ()
(gdb) bt
#0  0x0000000000e3f6d0 in dfs_get_pure_virtuals(tree_node*, void*) ()
#1  0x0000000000e3e302 in get_pure_virtuals(tree_node*) ()
#2  0x0000000000d087e2 in finish_struct_1(tree_node*) ()
#3  0x0000000000d002a1 in finish_struct(tree_node*, tree_node*) ()
#4  0x0000000000c6bc58 in cp_parser_class_specifier_1(cp_parser*) [clone
.lto_priv.4355] ()
#5  0x0000000000c5e2ef in cp_parser_decl_specifier_seq(cp_parser*, int,
cp_decl_specifier_seq*, int*) [clone .lto_priv.3863] ()
#6  0x0000000000c5c7e0 in cp_parser_block_declaration(cp_parser*, bool) [clone
.lto_priv.4014] ()
#7  0x0000000000c5bc1d in cp_parser_declaration(cp_parser*) [clone
.lto_priv.4104] ()
#8  0x0000000000c5b8d8 in cp_parser_declaration_seq_opt(cp_parser*) [clone
.lto_priv.4092] ()
#9  0x0000000000c7a56b in cp_parser_namespace_definition(cp_parser*) [clone
.lto_priv.3836] ()
#10 0x0000000000c5be8c in cp_parser_declaration(cp_parser*) [clone
.lto_priv.4104] ()
#11 0x0000000000c5b8d8 in cp_parser_declaration_seq_opt(cp_parser*) [clone
.lto_priv.4092] ()
#12 0x0000000000c41683 in c_parse_file() ()
#13 0x0000000000c10ab2 in c_common_parse_file() ()
#14 0x0000000000c10921 in compile_file() [clone .lto_priv.2466] ()
#15 0x0000000000b56e02 in toplev_main(int, char**) ()
#16 0x00007ffff7756fb0 in __libc_start_main () from /lib/libc.so.6
#17 0x0000000000b511c7 in _start ()

Reducing.