This week's Trending Up looks at some new and old cuts on the soundtrack to the new hit sequel, as well as a viral new pop song and another revived 2016 gem. Meryl Streep and Anne Hathaway in "The Devil Wears Prada 2" Courtesy Trending on Billboard Welcome to Billboard Pro’s  Trending Up  newsletter, where we take a closer look at the songs, artists, curiosities and trends that have caught the music industry’s attention. Some have come out of nowhere, others have taken months to catch on, and all of them could become ubiquitous in the blink of a TikTok clip.   This week: The Devil Wears Prada 2 makes all the money and gets a bunch of soundtrack bumps, memories of Mac Miller bring listeners back to 2016 (again), and social media jokes help mint a new streaming hit.…