Jimmy Fallon Destroys Post Malone's Upcoming Artist Tyla Yaweh In Rap Battle

[[tmz:video id="0_nj3uvhxx"]] You better come correct if you challenge Jimmy Fallon to a rap battle ... 'cause Jimmy just put one of Post Malone's artists in a body bag. The 'Tonight Show' host wasn't playing around when he went rhyme-for-rhyme…