Contrary to the holding in Hill v. Lockhart, 474 U.S. 52 (985) - which held that a
defendant must allege that, but for counsel's error, the defendant would have gone to
trial - can a defendant who validly pleads guilty successfully assert a claim of ineffective
assistance of counsel by alleging instead that, but for counsel's error in failing to
communicate a plea offer, he would have pleaded guilty with more favorable terms?