* doc/invoke.texi: Delete mcmodel=medium from powerpc options.
	* config/rs6000/rs6000.h (enum rs6000_cmodel): Delete CMODEL_MEDIUM.
	* config/rs6000/linux64.h (SUBSUBTARGET_OVERRIDE_OPTIONS): Set
	CMODEL_LARGE as default.
	* config/rs6000/rs6000.c (rs6000_handle_option): Remove mcmodel=medium.
	(offsettable_ok_by_alignment): Delete.
	(rs6000_emit_move): Remove mcmodel=medium optimization.

From-SVN: r161371