i386.h (MASK_CLASS_P): New define.

	* config/i386/i386.h (MASK_CLASS_P): New define.
	* config/i386/i386.c (inline_secondary_memory_needed): Ensure that
	there are no registers from different register sets also when
	mask registers are used.  Update function comment.
	* config/i386/i386.md (*movsi_internal): Split (*k/*krm) alternative
	to (*k/*r) and (*k/*km) alternatives.

From-SVN: r244548