[Bug bootstrap/65150] bootstrap failure at r220878 on x86_64 darwin

[howarth at bromo dot med.uc.edu]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65150

--- Comment #2 from howarth at bromo dot med.uc.edu ---
Caused by...

r220875 | jakub | 2015-02-20 11:44:37 -0500 (Fri, 20 Feb 2015) | 8 lines

        PR target/63892
        * ipa-icf.c (sem_function::merge): If DECL_COMDAT_GROUP (alias->decl),
        don't try to create_thunk if stdarg_p.  If
        !sem_item::target_supports_symbol_aliases_p (), similarly, and try to
        redirect_callers if possible.
        (sem_item_optimizer::execute): Call unregister_hooks here...
        (ipa_icf_driver): ... instead of here.

Could this failure be due to the absence of alias support on darwin?