spawn() results in valgrind warnings #14890
Description
TaskBuilder::spawn() is causing a "conditional jump or move depends on uninitialized values(s)" error in valgrind.
fn main() { spawn(proc() {}) }
Is the absolute minimum required to reproduce, and the error message is still present if a TaskBuilder is created and TaskBuilder::spawn() is called directly. Tested on 18c451f (most recent master as of this post).