Executives from tech companies such as Adobe Systems (ADBE), AT&T (T) and Cisco Systems (CSCO) are hoping for subpar performances on Thursday. Fortunately for investors, they'll be on the golf course, taking part in the annual AT&T Pebble Beach National Pro-Am. The event pairs professional golfers like Phil Mickelson with celebrities like Bill Murray and Ray Romano. Filing out the amateur half of the pairings are many top corporate executives,