* alias.c (canon_rtx): Make it global.
	(rtx_equal_for_memref_p): CONST_INT equality is now pointer
	equality.
	* cse.c (struct table_elt): Add canon_exp.
	(insert): Clear it.
	(invalidate): Canonicalize expressions only once.
	* rtl.h (canon_rtx): Declare.

From-SVN: r32845