MFH: r484853 r484854

Add support of -fuse-ld=lld

Merge support from upstream gcc for -fuse-ld=lld. It's already committed and
should appear in a future release.

PR: 233174
Submitted by: brooks
Sponsored by: The FreeBSD Foundation

Remove a sneaked change in r484853

Sponsored by: The FreeBSD Foundation

Approved by: ports-secteam (miwi)