btrace-btrace: signal record-goto stop
    
    When changing a thread's replay position, call record_signal_goto_stop instead
    of printing the source location directly.  This will signal the stop to
    front-ends and have them print the source location.
    
    We update the STOP_PC if the change affects the selected thread.
    
    Signed-off-by: Markus Metzger  <markus.t.metzger@intel.com>
    
    gdb/
    	* record-btrace.c (record_btrace_set_replay): Check ptid before updating
    	STOP_PC.  Call record_signal_goto_stop.
    
    Change-Id: If2cb2b9572396a2e5475d6611c7e9f79547c6f61