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.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/std/builtin.zig b/lib/std/builtin.zig
index ba5801e936..72503b7d2f 100644
--- a/lib/std/builtin.zig
+++ b/lib/std/builtin.zig
@@ -643,12 +643,12 @@ pub const PrefetchOptions = struct {
     /// The cache that the prefetch should be preformed on.
     cache: Cache = .data,
 
-    pub const Rw = enum(u1) {
+    pub const Rw = enum {
         read,
         write,
     };
 
-    pub const Cache = enum(u1) {
+    pub const Cache = enum {
         instruction,
         data,
     };