Patch for IA64 32-bit function descriptors

[Jessica Han]

We do hope the change can go back to FSF tree, without the patch, C++ is
totally broken on IA64 HPUX. Is there a way to change the source file
(tinfo.cc ) at configuration time? Thanks.

>
>This is the only target-specific code in this file. It seems like a bad
>idea to start doing this. Perhaps HP could live with this as a local
>hack in their tree?
>
>-benjamin
>