[OE-core] [thud][PATCH v4] gcc: CVE fix for gcc <CVE-2019-15847>

[Mikko.Rapeli at bmw.de]

Looks ok, though I would consider updating to point releases or latest
versions of the gcc-8 stable tree, where these patches are already backported
by upstream developers. The 8.3 update does not have this CVE patch, but
a lot of bug fixes which should be useful for gcc 8 users.

Reviewed-by: Mikko Rapeli <mikko.rapeli at bmw.de>

-Mikko