gas/
	* config/tc-mips.c (append_insn): Don't do branch relaxation for
	MIPS-3D instructions either.
	(md_convert_frag): Update the COPx branch mask accordingly.

	* config/tc-mips.c (md_show_usage): Document --[no-]relax-branch
	option.
	* doc/as.texinfo (Overview): Add --relax-branch and
	--no-relax-branch.
	* doc/c-mips.texi (MIPS Opts): Document --relax-branch and
	--no-relax-branch.

	gas/testsuite/
	* gas/mips/relax-bc1any.l: New test.
	* gas/mips/relax-bc1any.s: New test source.
	* gas/mips/mips.exp: Run the new test.