Second patch for HP-UX IA64 bootstrap failure

[Steve Ellcey]

> Argh.  I forgot the ADDR_EXPR had already been stripped.
> Irritating that it worked with the first test case... ;-)
> 
> > Should tmode just be set to ptr_mode?
> 
> No, s390 has both 32 and 64 bit pointers simultaneously.
> The user can select via __attribute__((mode("..."))).
> 
> One more try.
> 
> 
> r~

This one works on all my small test cases, I'll do a complete bootstrap
and test overnight and let you know how it goes.

Steve Ellcey
sje@cup.hp.com