alignment: store_one_arg vs emit_push_insn

[Richard Kenner]

    > No, it looks right to me.  PARM_BOUNDARY is the smallest alignment a
    > parameter is allowed to have, but some might be more aligned.

    Then emit_push_insn is misusing it, as it uses it as the alignment of
    the source, not just the destination.

I don't follow.  emit_push_insn barely uses it *at all*.