* config/m68hc11/m68hc11.md ("*addsi3"): Use 'o' constraint to

	avoid the auto increment addressing modes.
	("*subsi3"): Likewise.
	(split for add/sub on address): For 68HC12 push the value on
	the stack and do the operation with a pop.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@55083 138bc75d-0d04-0410-961f-82ee72b054a4