[Bug c/67764] -Wconversion generates false warnings for bitmask+cast expressions

[marcin.slusarz at intel dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67764

--- Comment #4 from Marcin Ślusarz <marcin.slusarz at intel dot com> ---
The issue is similar. However what I described in this bug can be considered a
regression, because gcc 4.9 behaves correctly. Bug 40752 is 6 years old.