Problem in locate_and_pad_parm

[Richard Kenner]

    Is this related to the expr.h:MUST_PASS_IN_STACK() early limitation of
    GCC which we still are carrying around about which way values are
    aligned in argument registers?  We had a long discussion about this a
    few years ago, but some confusion remained and no changes were
    implemented.

I don't think so.  This conditionalization isn't on how arguments are
alignment but on whether arguments grow upward or downward.