[Bug gcov-profile/94410] 511.povray_r is 11% slower built at -O2 PGO+LTO than with GCC 9 and same options

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94410

--- Comment #2 from Martin Jambor <jamborm at gcc dot gnu.org> ---
For the record, SPEC 2006 453.povray is similarly affected, the commit
makes it run 26% slower.