gen_pro_epilogue_adjust_stack; update arguments.
        (ix86_expand_epilogue): Likewise.
        (ix86_emit_epilogue_esp_adjustment): Remove.
        (ix86_adjust_cost): Remove pro_epilogue_adjust_stack hack.
        * config/i386/i386.md (pro_epilogue_adjust_stack): Use a BLKmode
        clobber of scratch memory instead of a modification of EBP as the
        barrier.  Update all peepholes to match.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43284 138bc75d-0d04-0410-961f-82ee72b054a4