Reapply "New implementation of {,Linked}Hash{Set,Map}."

tests/co19/co19-runtime.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == none && $runtime == vm && $checked ]
 LibTest/core/Strings/concatAll_A04_t01: Fail, OK # checks for ArgumentError. TypeError is ok too. co19 issue 366
 LibTest/core/Strings/join_A04_t01: Fail, OK # checks for ArgumentError. TypeError is ok too. co19 issue 366
 
 [ $compiler == none && $runtime == vm ]
 Language/13_Libraries_and_Scripts/1_Imports_A02_t21: Crash # Dart issue 6060
@@ skipping 486 matching lines @@
 LibTest/core/Queue/isEmpty_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/last_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/last_A02_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/length_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/removeFirst_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/removeFirst_A02_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/removeLast_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Queue/removeLast_A02_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 LibTest/core/Set/Set.from_A01_t01: Fail # Moved collection classes from core to collection. co19 issue 371.
 
+# Doesn't expect null to be allowed in Set or Map keys (issue 377).
+LibTest/core/Map/containsKey_A01_t02: Fail
+LibTest/core/Map/operator_subscript_A01_t02: Fail
+LibTest/core/Map/operator_subscripted_assignment_A01_t02: Fail
+LibTest/core/Map/remove_A01_t02: Fail
+LibTest/core/Set/add_A01_t02: Fail
+LibTest/core/Set/addAll_A01_t02: Fail
+LibTest/core/Set/contains_A01_t02: Fail
+LibTest/core/Set/containsAll_A01_t02: Fail
+LibTest/core/Set/intersection_A03_t01: Fail
+LibTest/core/Set/isSubsetOf_A01_t02: Fail
+LibTest/core/Set/remove_A01_t02: Fail
+LibTest/core/Set/removeAll_A01_t02: Fail
+
+# Doesn't expect concurrent modification error (issue 376).
+LibTest/core/Map/forEach_A01_t07: Fail
+
 [ $compiler == none && $runtime == vm && $unchecked ]
 LibTest/core/Future/chain_A02_t05: Fail # Future is in async library. co19 issue 367
 LibTest/core/Future/transform_A02_t04: Fail # Future is in async library. co19 issue 367
 
 [ $compiler == none && $runtime == vm && $checked ]
 LibTest/isolate/SendPort/call_A01_t01: Fail # Future is in async library. co19 issue 367
 Language/14_Types/4_Interface_Types_A08_t06: Fail # Moved collection classes from core to collection. co19 issue 371.
 
 [ $compiler == none && $arch == simarm ]
 *: Skip
 
 [ $compiler == none && $arch == arm ]
 *: Skip
 
 [ $compiler == none && $arch == simmips ]
 *: Skip
 
 [ $compiler == none && $arch == mips ]
 *: Skip