Migrated test block 25 to Dart 2.0.

tests/corelib_2/corelib_2.status

Index: tests/corelib_2/corelib_2.status
diff --git a/tests/corelib_2/corelib_2.status b/tests/corelib_2/corelib_2.status
index a4c8c3c6ef8faecfd2afc42e216cd6900b9134de..031a42ff8b5b59122f2ae414b9c3e65cd5b92fd9 100644
--- a/tests/corelib_2/corelib_2.status
+++ b/tests/corelib_2/corelib_2.status
@@ -41,6 +41,8 @@ const_list_literal_test: RuntimeError # Issue 29921
 const_list_remove_range_test: RuntimeError # Issue 29921
 const_list_set_range_test: RuntimeError # Issue 29921
 compare_to2_test: RuntimeError # Issue 30170
+hash_set_test/01: RuntimeError # Issue 29921
+regress_r21715_test: RuntimeError # Issue 29921
 string_operations_with_null_test: RuntimeError # Issue 29921
 string_replace_test: RuntimeError # Issue 29921
 symbol_operator_test: RuntimeError # Issue 29921
@@ -57,6 +59,7 @@ big_integer_parsed_div_rem_vm_test: RuntimeError # Issue 29921
 big_integer_parsed_mul_div_vm_test: RuntimeError # Issue 29921
 bit_twiddling_bigint_test: RuntimeError # Required bigint support.
 compare_to2_test: RuntimeError, OK # Requires bigint support.
+regress_r21715_test: RuntimeError # Requires bigint support.
 
 [ $compiler == dart2js && $runtime == drt && $csp && $minified ]
 core_runtime_types_test: Pass, Fail # Issue 27913
@@ -149,6 +152,7 @@ symbol_reserved_word_test/07: MissingCompileTimeError # Issue 11669, 19972
 symbol_reserved_word_test/10: MissingCompileTimeError # Issue 11669, 19972
 
 [ $compiler == dart2js ]
+hash_set_test/01: RuntimeError # Issue 11551
 string_static_test: MissingCompileTimeError
 symbol_test/04: MissingCompileTimeError