38880 use search_mut function rather than search_hashed

Author: technicalguy

src/libstd/collections/hash/map.rs

@@ -1039,9 +1039,7 @@ impl<K, V, S> HashMap<K, V, S>
     pub fn entry(&mut self, key: K) -> Entry<K, V> {
         // Gotta resize now.
         self.reserve(1);
-        let hash = self.make_hash(&key);
-        search_hashed(&mut self.table, hash, |q| q.eq(&key))
-            .into_entry(key).expect("unreachable")
+        self.search_mut(&key).into_entry(key).expect("unreachable")
     }
 
     /// Returns the number of elements in the map.