* i386.md (movstrsi, clrstrsi): Support variable sized copies, align
	destination when needed.
	(strmovsi, strsetsi): New expander.
	(strmovsi_1, strsetsi_1): New pattern.
	* i386.h (MASK_NO_ALIGN_STROP, MASK_INLINE_ALL_STROP,
	TARGET_ALIGN_STRINGOPS, TARGET_INLINE_ALL_STRINGOPS): New macros.
	(TARGET_SWITCHES) Add align-stringops and inline-all-stringops.
	* invoke.texi (align-stringops, inline-all-stringops): Document.

From-SVN: r31773