PERFORCE change 133911 for review

[Peter Grehan]

> sparc64 is apparently using this for libc connection (not sure if
> this  is what Peter was referring to in one of the previous emails?),

  See libc/sparc64/sys/__sparc_utrap_setup.c for how the user-space trap 
handlers are setup. Very nice. And it reminded me that PPC should really 
migrate to having the signal trampoline be in libc ala sparc64 rather 
than being copied out to and forcing the stack to be executable.

later,

Peter.