reg-stack.c: Do not emit pop insns after cc0 setter.

reg-stack.c: Do not emit pop insns after cc0 setter.

        * reg-stack.c: Do not emit pop insns after cc0 setter.
        (emit_pop_insn): Do not emit insn in case WHEN is NULL.
        (compare_for_stack_reg): Update REG_DEAD note and
        do not emit push insn.
        * i386.c: (output_float_compare): Handle new REG_DEAD notes.

From-SVN: r26965