Make List constructor give better error messages for non-int arguments

tests/corelib/corelib.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 == drt || $runtime == dartium || $runtime == ContentShellOnAndroid) ]
 bool_from_environment2_test: Skip
 bool_from_environment_test: Skip
 from_environment_const_type_test: Skip
 from_environment_const_type_undefined_test: Skip
 int_from_environment2_test: Skip
@@ skipping 81 matching lines @@
 [ $runtime == ff ]
 double_round3_test: Pass, Fail, OK # Fails on ff 34, passes on ff 35. Runtime rounds 0.49999999999999994 to 1.
 double_round_to_double2_test: Pass, Fail, OK # Fails on ff 34, passes on ff 35. Runtime rounds 0.49999999999999994 to 1.
 
 [ $runtime == opera ]
 core_runtime_types_test: Fail
 null_nosuchmethod_test: Fail # Issue: 7413
 unicode_test: Fail # Issue 14694
 
 [ $compiler == dart2js ]
-growable_list_test: RuntimeError # Fails to detect concurrent modification in addAll.
 error_stack_trace1_test: RuntimeError # Issue 12399
 hash_set_test/01: RuntimeError # Issue 11551
 integer_to_string_test/01: RuntimeError # Issue 1533
 iterable_return_type_test/01: RuntimeError # Issue 20085
 iterable_return_type_test/02: RuntimeError # Dart2js does not support Uint64*.
 
 big_integer_*: Skip # VM specific test.
 bit_twiddling_bigint_test: RuntimeError # Requires bigint support.
 compare_to2_test: RuntimeError, OK    # Requires bigint support.
 string_base_vm_test: RuntimeError, OK # VM specific test.
@@ skipping 111 matching lines @@
 list_test/01: RuntimeError # this.get$length is not a function
 list_test/none: RuntimeError # this.get$length is not a function
 main_test: RuntimeError # receiver.get$_collection$_nums is not a function
 map_values2_test: RuntimeError # Please triage this failure.
 map_values3_test: RuntimeError # Please triage this failure.
 map_values4_test: RuntimeError # Please triage this failure.
 regexp/pcre_test: Crash # Stack Overflow
 shuffle_test: RuntimeError # Please triage this failure.
 stacktrace_fromstring_test: RuntimeError # receiver.get$_collection$_nums is not a function
 string_fromcharcodes_test: RuntimeError # Please triage this failure.
-symbol_operator_test/03 : RuntimeError # 
+symbol_operator_test/03 : RuntimeError #
 symbol_reserved_word_test/03: Pass # Please triage this failure.
 symbol_reserved_word_test/06: RuntimeError # Please triage this failure.
 symbol_reserved_word_test/09: RuntimeError # Please triage this failure.
 symbol_reserved_word_test/12: RuntimeError # Please triage this failure.
 symbol_test/none: Crash # The null object does not have a getter '_element'.
 uri_test: Crash # Invalid argument(s)