aco/util: fix bit_reference::operator&=

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Backport-to: 24.3
(cherry picked from commit 46787fc2d0)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33113>

.pick_status.json

@@ -1204,7 +1204,7 @@
         "description": "aco/util: fix bit_reference::operator&=",
         "nominated": true,
         "nomination_type": 4,
-        "resolution": 0,
+        "resolution": 1,
         "main_sha": null,
         "because_sha": null,
         "notes": null

src/amd/compiler/aco_util.h

@@ -793,7 +793,7 @@ template <typename T> struct bit_reference {
 
    constexpr bit_reference& operator&=(bool val)
    {
-      storage &= T(val) << bit;
+      storage &= ~(T(!val) << bit);
       return *this;
    }