Problem in locate_and_pad_parm

[Joern Rennecke]

> 	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. 

Actually, there was a change.  MUST_PASS_IN_STACK can now be overridden
in the tm.h file, and some targets actually do this today.