[Bug ipa/63576] [5 Regression] ICE : in ipa_merge_profiles, at ipa-utils.c:540 during Firefox LTO/PGO build

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63576

--- Comment #7 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 34490
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34490&action=edit
Proposed fix

I am going to try build firefox with PDO myself with the attached patch. It is
bit tricky to merge the speculation right becuase both variant may disagree on
speculative target.