Backport r496295 | andreast | 2019-03-19 22:03:17 from lang/gcc8-devel:
This commit brings multilib support for gcc on amd64. This means you can compile and execute 32-bit binaries with gcc. The gcc part will be upstreamed as soon as gcc trunk opens for new commits. On the release front, gcc8, we will merge this commit after a week or so.