This patch makes it possible to get into tfind mode even if the current 
thread is running (aka non-stop mode) or has no stack frames for some 
other reason.

It would be good to add a testsuite test for this, but it seems there 
are no tests of non-stop outside of MI?  Are there difficult portability 
issues perhaps?

Stan

2010-04-12  Stan Shebs  <stan@codesourcery.com>

    * frame.c: Include tracepoint.h.
    (get_current_frame): Allow a trace frame to be an alternate source
    of stack frame data.
    * tracepoint.c (tfind_1): Don't try to get current stack frame if
    it won't succeed.