Revert "stage2: implement `@prefetch`"

This reverts commit d48e4245b68bf25c7f41804a5012ac157a5ee546.

I have no idea why this is failing Drone CI, but in a branch, reverting
this commit solved the problem.
f423b5949bAndrew Kelley committed on 1/18/2022, 5:47:02 PMparent4938fb8
14 files changedLine totals unavailable