1a11bb8f76
Enable the in-tree binutils to assemble and disassemble amd64 FSGSBASE instructions (rdfsbase, rdgsbase, wrfsbase, wrgsbase), used in the base system since r322763. This gives one last gasp for in-tree gcc, and provides a small enhancement for in-tree binutils objdump. Reviewed by: dim, kib Approved by: markj (mentor) Sponsored by: Dell EMC Isilon Differential Revision: https://reviews.freebsd.org/D12222