This is mostly useless then since lwsync is just a sync to a processor
that doesn't know it (it's a sync with a reservd bit set) :-) Or it's
just to make gas happy if you specify a processor type that doesn't 
have
lwsync ?

GAS doesn't care (I tried with -Wa,-m405).  Support for this insn
was added to binutils in august 2001; do we still support older
binutils than that?  If so, we should just do the ".long" trick in
a lwsync() inline function, like we do for similar cases.


Segher