Summary: m68k: add missing early clobber in beq0_di, bne0_di patterns

* config/m68k/m68k.md (beq0_di, bne0_di): Make the "o" constraint
a separate alternative where the scratch operand 2 is marked as
early clobber.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211104 138bc75d-0d04-0410-961f-82ee72b054a4