Remove default_map

cranelift/codegen/meta/src/default_map.rs

@@ -1,20 +0,0 @@
-//! Trait for extending `HashMap` with `get_or_default`.
-use std::collections::HashMap;
-use std::hash::Hash;
-
-pub(crate) trait MapWithDefault<K, V: Default> {
-    fn get_or_default(&mut self, k: K) -> &mut V;
-}
-
-impl<K: Eq + Hash, V: Default> MapWithDefault<K, V> for HashMap<K, V> {
-    fn get_or_default(&mut self, k: K) -> &mut V {
-        self.entry(k).or_insert_with(V::default)
-    }
-}
-
-#[test]
-fn test_default() {
-    let mut hash_map = HashMap::new();
-    hash_map.insert(42, "hello");
-    assert_eq!(*hash_map.get_or_default(43), "");
-}

cranelift/codegen/meta/src/lib.rs

@@ -11,7 +11,6 @@ mod gen_inst;
 mod gen_settings;
 mod gen_types;
 
-mod default_map;
 mod shared;
 mod unique_table;