Mike Judge, co-creator of "King of the Hill" and voice of Hank Hill, tells TMZ ... "I am deeply saddened by the loss of my friend Johnny Hardwick. He was a great writer, actor and comedian, and he will be deeply missed." Johnny Hardwick, known for playing Dale Gribble on "King of the Hill," has…

Mike Judge -- the mega-genius behind "Beavis and Butt-Head" and "King of the Hill" -- blinded us with awesomeness last night ... by busting out the voices of THREE of his kick-ass characters!!! Judge -- who's about to release NEW episodes of "B & B" -- was hanging out at the Andaz Hotel in L.A.…