using these to load long doubles, but they aren't implemented in hardware
on (at least) UltraSPARC I and II machines.
Emulate popc in the user trap handler as well.
Re-arrange slightly to make support functions more accessible.
Reviewed by: tmm
Add support for handling floating point disabled traps mostly in userland
for the simple single threaded case. Not yet enabled by default.
Implement __sparc_utrap_install as specified by the sparc abi.
