PR optimization/13424 (hppa), bootstrap/14462, c/14828

	PR optimization/13424 (hppa), bootstrap/14462, c/14828
	* pa.md: Use replace_equiv_address to retain the attributes of the
	memory operands used in the split and peephole2 patterns for optimizing
	the pre-reload movstrsi, movstrdi, clrstrsi and clrstrdi patterns.

Co-Authored-By: John David Anglin <dave.anglin@nrc-cnrc.gc.ca>

From-SVN: r80433