Remove calls to heapsize (#10432)

* update memorydb trait
* use malloc_size_of instead of heapsize_of
* use jemalloc as default allocator for parity client.

ethcore/src/snapshot/tests/state.rs

@@ -40,7 +40,7 @@ const RNG_SEED: [u8; 16] = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16];
 
 #[test]
 fn snap_and_restore() {
-	use hash_db::HashDB;
+	use hash_db::{HashDB, EMPTY_PREFIX};
 	let mut producer = StateProducer::new();
 	let mut rng = XorShiftRng::from_seed(RNG_SEED);
 	let mut old_db = journaldb::new_memory_db();
@@ -97,7 +97,7 @@ fn snap_and_restore() {
 	let keys = old_db.keys();
 
 	for key in keys.keys() {
-		assert_eq!(old_db.get(&key).unwrap(), new_db.as_hash_db().get(&key).unwrap());
+		assert_eq!(old_db.get(&key, EMPTY_PREFIX).unwrap(), new_db.as_hash_db().get(&key, EMPTY_PREFIX).unwrap());
 	}
 }
 
@@ -106,7 +106,7 @@ fn get_code_from_prev_chunk() {
 	use std::collections::HashSet;
 	use rlp::RlpStream;
 	use ethereum_types::{H256, U256};
-	use hash_db::HashDB;
+	use hash_db::{HashDB, EMPTY_PREFIX};
 
 	use account_db::{AccountDBMut, AccountDB};
 
@@ -128,7 +128,7 @@ fn get_code_from_prev_chunk() {
 
 	let mut make_chunk = |acc, hash| {
 		let mut db = journaldb::new_memory_db();
-		AccountDBMut::from_hash(&mut db, hash).insert(&code[..]);
+		AccountDBMut::from_hash(&mut db, hash).insert(EMPTY_PREFIX, &code[..]);
 		let p = Progress::default();
 		let fat_rlp = account::to_fat_rlps(&hash, &acc, &AccountDB::from_hash(&db, hash), &mut used_code, usize::max_value(), usize::max_value(), &p).unwrap();
 		let mut stream = RlpStream::new_list(1);