chore(tvix/eval): Pass in VM to nix_eq

Pass in, but ignore, a mutable reference to the VM to the `nix_eq`
functions, in preparation for using that VM to force thunks during
comparison.

Change-Id: I565435d8dfb33768f930fdb5a6b0fb1365d7e161
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6651
Autosubmit: grfn <grfn@gws.fyi>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <tazjin@tvl.su>

tvix/eval/src/vm.rs

@@ -265,7 +265,7 @@ impl<'o> VM<'o> {
                 OpCode::OpEqual => {
                     let v2 = self.pop();
                     let v1 = self.pop();
-                    let res = fallible!(self, v1.nix_eq(&v2));
+                    let res = fallible!(self, v1.nix_eq(&v2, self));
 
                     self.push(Value::Bool(res))
                 }