By Noel Randewich and Shristi Achar A (Reuters) – The Nasdaq ended sharply higher on Thursday after Alphabet and Advanced Micro Devices sparked a megacap rally on fresh optimism about artificial intelligence. Shares of Alphabet jumped 5.3% as analysts cheered the launch of the Google-parent’s newest AI model, while AMD soared nearly 10% after the company estimated the potential market for its data center AI chips could reach $45 billion this year. Other heavyweight tech-related stocks also gained, with Nvidia and Meta Platforms rising over 2%, Amazon up 1.6% and Apple 1% higher. The Philadelph…