Various token issues fixed in the compiler

tests/co19/co19-leg.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 == dart2js && $system == macos && $runtime == d8 ]
 LibTest/core/Math/acos_A01_t01: Fail, OK
 LibTest/core/Math/asin_A01_t01: Fail, OK
 LibTest/core/Math/atan_A01_t01: Fail, OK
 
+[ $compiler == dart2js && $system == windows && $runtime == d8 ]
+Language/12_Libraries_and_Scripts/2_Imports_A02_t10: Fail # Compile-time error: duplicate definition
+LibTest/core/double/operator_remainder_A01_t04: Fail
 
 [ $compiler == dart2js ]
 Language/07_Classes/5_Constructors/2_Factories_A01_t01: Crash
 Language/10_Expressions/09_This_A03_t04: Crash
 Language/11_Statements/05_For_A01_t13: Crash
 
 # This test sometimes passes (as a negative test), sometimes it
 # crashes. The problem is that there is a stack overflow in
 # dart2js. The reason for the test sometimes passing is VM issue
 # 3874. The stack overflow is addressed in
@@ skipping 181 matching lines @@
 LibTest/core/RegExp/Pattern_semantics/firstMatch_CharacterClassEscape_A03_t01: Fail, Pass # issue 3333
 
 Language/10_Expressions/03_Numbers_A01_t06: Fail, OK # Requires bigint.
 Language/10_Expressions/03_Numbers_A01_t09: Fail, OK # Requires bigint.
 LibTest/core/Date/Date_A01_t01: Fail, OK # Generates bad date and expect exact print string.
 LibTest/core/Date/year_A01_t01: Fail, OK # Requires big int.
 LibTest/core/List/sort_A01_t02: Fail, OK # No method List.copyFrom.
 LibTest/core/List/sort_A01_t03: Fail, OK # No method List.copyFrom.
 LibTest/core/Match/pattern_A01_t01: Fail, OK # Bad test, allMatches return an Iterable.
 LibTest/core/Match/str_A01_t01: Fail, OK # Bad test, allMatches return an Iterable.
-LibTest/core/Math/exp_A01_t01: Fail, OK # TODO(floitsch): Review.
+LibTest/core/Math/exp_A01_t01: Fail, Pass, OK # TODO(floitsch): Review.
 LibTest/core/Math/pow_A01_t01: Fail, OK # Bad test (uses x.pow(y), not Math.pow(x, y)).
 LibTest/core/Math/pow_A11_t01: Fail, OK # TODO(floitsch): Review.
 LibTest/core/Math/pow_A13_t01: Fail, OK # TODO(floitsch): Review.
 LibTest/core/Math/sin_A01_t01: Fail, OK # TODO(floitsch): Review.
 LibTest/core/Math/tan_A01_t01: Fail, OK # TODO(floitsch): Review.
 LibTest/core/RegExp/Pattern_semantics/firstMatch_NonEmptyClassRanges_A01_t01: Fail, OK # This is not rejected by V8.
 LibTest/core/RegExp/Pattern_semantics/firstMatch_Term_A04_t01: Fail, OK # co19 issue 92.
 LibTest/core/RegExp/RegExp_A01_t03: Fail, OK # Expects exception from const constructor.
 LibTest/core/RegExp/RegExp_A01_t04: Fail, OK # Expects exception from const constructor.
 LibTest/core/RegExp/allMatches_A01_t01: Fail, OK #  Bad test, allMatches return an Iterable.
@@ skipping 468 matching lines @@
 Language/12_Libraries_and_Scripts/2_Imports_A07_t01: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/2_Imports_A07_t02: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/2_Imports_A08_t02: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/3_Includes_A01_t01: Fail, OK # @compile-error
 Language/12_Libraries_and_Scripts/3_Includes_A03_t03: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A07_t02: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A07_t03: Fail, OK # @compile-error
 Language/13_Types/7_Type_Void_A01_t02: Fail, OK # @compile-error
 Language/14_Reference/1_Lexical_Rules/1_Reserved_Words_A30_t04: Fail, OK # @compile-error
 Language/14_Reference/1_Lexical_Rules_A02_t06: Fail, OK # @compile-error