PR driver/55470
	* collect2.c (main): Support -fuse-ld=bfd and -fuse-ld=gold.

	* common.opt: Add fuse-ld=bfd and fuse-ld=gold.

	* gcc.c (LINK_COMMAND_SPEC): Pass -fuse-ld=* to collect2.

	* opts.c (comman_handle_option): Ignore -fuse-ld=bfd and
	-fuse-ld=gold.

	* doc/invoke.texi: Document -fuse-ld=bfd and -fuse-ld=gold.

Co-Authored-By: Doug Kwan <dougkwan@google.com>
Co-Authored-By: H.J. Lu <hongjiu.lu@intel.com>
Co-Authored-By: Matthias Klose <doko@debian.org>

From-SVN: r194983