* config/sparc/sparc.opt (mimpure-text): Move ...
	* config/sol2.opt: ... here.
	Correct description.
	* config.gcc (*-*-solaris2*): Add sol2.opt to extra_options.
	* doc/invoke.texi (Option Summary, SPARC Options): Move
	-mimpure-text, -mno-impure-text, -threads, -pthreads, -pthread ...
	(Option Summary, Solaris 2 Options): ... here.
	(Submodel Options, Solaris 2 Options): New menu entry.
	(SPARC Options): Move -mimpure-text, -threads, -pthreads, -pthread ...
	(Solaris 2 Options): ... here.

From-SVN: r164757