Fix HashStable implementation on InferTy

src/test/ui/traits/vtable/issue-91807.rs

@@ -0,0 +1,17 @@
+// check-pass
+// incremental
+
+struct Struct<T>(T);
+
+impl<T> std::ops::Deref for Struct<T> {
+    type Target = dyn Fn(T);
+    fn deref(&self) -> &Self::Target {
+        unimplemented!()
+    }
+}
+
+fn main() {
+    let f = Struct(Default::default());
+    f(0);
+    f(0);
+}