An optimistic note from a Wall Street analyst lifted Cirrus and other chip stocks, too.Shares of audio mixed-signal chipmaker Cirrus Logic (CRUS 3.86%) were rising on Tuesday, up as much as 6.3% at one point before pulling back to a 4.1% gain as of 2:30 p.m. ET. Cirrus rose on the back of a positive analyst note, which had good news for this smartphone-related chipmaker, as well as others.Keybanc's checks leave its chip analyst optimisticIn a research note published today, Keybanc analyst John Vinh raised h ...