[Bug lto/78140] [7 Regression] libxul -flto uses 1GB more memory than gcc-6

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78140

--- Comment #4 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
Basicaly just "-O3 -flto".