[Bug gcov-profile/47618] Collecting multiple profiles and using all for PGO

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=47618

--- Comment #20 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Petr Špaček from comment #19)
> Sure, I would be happy with any version, thank you!
> 
> For people who want to generate code coverage reports for parallel
> executions, beware of https://github.com/linux-test-project/lcov/issues/37.

Good. I will do it in timeframe of stage1 of GCC 9.