compiler/rust/bitset: Remove impl Not

This is extremely difficult to use correctly for bitsets of
different sizes. Also, nobody uses it. Remove the footgun.

Reviewed-by: Mary Guillemard <mary.guillemard@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32812>

src/compiler/rust/bitset.rs

@@ -2,7 +2,7 @@
 // SPDX-License-Identifier: MIT
 
 use std::ops::{
-    BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Not, Range,
+    BitAnd, BitAndAssign, BitOr, BitOrAssign, BitXor, BitXorAssign, Range,
 };
 
 #[derive(Clone)]
@@ -221,18 +221,6 @@ impl BitXor<BitSet> for BitSet {
     }
 }
 
-impl Not for BitSet {
-    type Output = BitSet;
-
-    fn not(self) -> BitSet {
-        let mut res = self;
-        for w in 0..res.words.len() {
-            res.words[w] = !res.words[w];
-        }
-        res
-    }
-}
-
 struct BitSetIter<'a> {
     set: &'a BitSet,
     w: usize,