* amd64obsd-tdep.c (amd64obsd_trapframe_cache): Fix detection of

* amd64obsd-tdep.c (amd64obsd_trapframe_cache): Fix detection of
interrupts from user space.
* i386obsd-tdep.c (i386obsd_trapframe_cache): Handle interrupt
frames too.
(i386obsd_trapframe_sniffer): Turn into a proper unwinder sniffer.
(i386obsd_trapframe_unwind): Add sniffer.
(i386obsd_init_abi): Prepend i386obsd_trapframe_unwind instead of
appending i386obsd_trapframe_sniffer.