[Bug lto/82229] GCC7's LTO underperforms compared to GCC6

[krzysio.kurek at wp dot pl]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82229

--- Comment #28 from krzysio.kurek at wp dot pl ---
I mean the relative performance is worse but still Profiled GCC6 is faster than
GCC 7 or GCC 8.