[3.3/3.4/4.0/4.1] IA-64 FP register file corruption on unwind

[Richard Kenner]

    You have to have about 18 or so FP variables live at the point where the
    exception is thrown and caught, or else you won't be able to see the
    breakage.  

Integers and pointers can live in FP registers too on IA64.  In the
particular case that spawned the PR, it was in fact a pointer that got
clobbered.