* 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.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@32845 138bc75d-0d04-0410-961f-82ee72b054a4