record: signal a record goto stop to front-ends
    
    The "record goto" command does not indicate the stop to front-ends.  Instead,
    it prints the new location directly.
    
    Add a function to signal a normal stop to observers and have them print the new
    location.  This function temporarily switches to the stopped thread.
    
    We use the TARGET_WAITKIND_NO_RESUMED wait status for this purpose.  This should
    result in a stop notification without giving a stop reason.  We could also
    invent a new wait status but this doesn't seem necessary at this point.
    
    Signed-off-by: Markus Metzger  <markus.t.metzger@intel.com>
    
    gdb/
    	* record.h (record_signal_goto_stop): New.
    	* record.c (record_signal_goto_stop): New.
    
    Change-Id: I0b196be68779f9e81abca78df5bc39e917023581