Update dart2js parser to disallow repeated comparisons and prefix +.

tests/co19/co19-dart2js.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 && $runtime == drt ]
 LibTest/core/List/sort_A01_t02: Pass, Fail # v8 bug: Issue 12293
 LibTest/core/List/sort_A01_t03: Pass, Fail # v8 bug: Issue 12293
 LibTest/core/Map/Map_class_A01_t04: Pass, Fail # v8 bug: Issue 12293
 
 [ $compiler == dart2js && $runtime == jsshell ]
@@ skipping 313 matching lines @@
 Language/06_Functions/2_Formal_Parameters/1_Required_Formals_A02_t04: Fail # Checks that static variable declaration can't be a required formal parameter
 Language/06_Functions/2_Formal_Parameters/1_Required_Formals_A02_t06: Fail # Checks that a functionSignature parameter cannot be final.
 Language/06_Functions/2_Formal_Parameters/1_Required_Formals_A02_t07: Fail # Checks that a functionSignature parameter cannot be declared as variable.
 Language/06_Functions/2_Formal_Parameters/2_Optional_Formals_A03_t03: Fail # TODO(ahe): Enforce optional parameter semantics.
 Language/06_Functions/2_Formal_Parameters/2_Optional_Formals_A03_t04: Fail # TODO(ahe): Enforce optional parameter semantics.
 Language/07_Classes/07_Classes_A02_t11: Fail # Checks that it is a compile-time error if a static final variable declaration does not include explicit initializer.
 Language/12_Expressions/01_Constants_A20_t03: Fail # Checks that an identifier expression that denotes a type parameter  can not be assigned to a constant variable.
 Language/12_Expressions/05_Strings/1_String_Interpolation_A01_t09: Fail # Checks that it is a compile-time error if a string interpolation construct does not start with IDENTIFIER_NO_DOLLAR or opening brace.
 Language/12_Expressions/05_Strings_A02_t46: Fail # Checks that multi-line strings that contain characters and sequences prohibited by this grammar, cause compile-time errors.
 Language/12_Expressions/05_Strings_A02_t48: Fail # Checks that multi-line strings that contain characters and sequences prohibited by this grammar, cause compile-time errors.
-Language/12_Expressions/22_Equality_A01_t15: Fail # Checks that equality expressions cannot be operands of another equality expression.
-Language/12_Expressions/22_Equality_A01_t16: Fail # Checks that equality expressions cannot be operands of another equality expression.
-Language/12_Expressions/23_Relational_Expressions_A01_t10: Fail # Checks that a relational expression cannot be the operand of another relational expression.
-Language/12_Expressions/23_Relational_Expressions_A01_t11: Fail # Checks that a relational expression cannot be the operand of another relational expression.
-Language/12_Expressions/23_Relational_Expressions_A01_t12: Fail # Checks that a relational expression cannot be the operand of another relational expression.
-Language/12_Expressions/23_Relational_Expressions_A01_t13: Fail # Checks that a relational expression cannot be the operand of another relational expression.
 Language/12_Expressions/30_Identifier_Reference_A04_t09: Fail # Checks that it is a compile-time error when a built-in identifier dynamic is used as the declared name of a type variable.
 Language/12_Expressions/30_Identifier_Reference_A05_t01: Fail # Checks that it is a compile-time error when a built-in identifier "abstract" is used as a type annotation of a local variable.
 Language/12_Expressions/30_Identifier_Reference_A05_t12: Fail # Checks that it is a compile-time error when a built-in identifier "static" is used as a type annotation of a local variable.
 Language/16_Reference/1_Lexical_Rules/1_Reserved_Words_A40_t04: Fail # Checks that other Unicode whitespaces are not allowed:  check NO-BREAK SPACE (U+00A0)
 Language/16_Reference/1_Lexical_Rules_A02_t06: Fail # Checks that Unicode whitespaces other than WHITESPACE are not permitted in the source code. Checks symbol U+00a0.
 
 
 #
 # Unexpected compile-time errors.
 #
@@ skipping 305 matching lines @@
 
 [ $compiler == dart2js ]
 Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t04: fail # co19-roll r587: Please triage this failure
 Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t04: fail # co19-roll r587: Please triage this failure
 LibTest/json/stringify_A01_t01: fail # co19-roll r587: Please triage this failure
 LibTest/json/stringify_A02_t01: fail # co19-roll r587: Please triage this failure
 LibTest/math/pow_A04_t01: fail # co19-roll r587: Please triage this failure
 LibTest/math/pow_A14_t01: fail # co19-roll r587: Please triage this failure
 LibTest/math/pow_A16_t01: fail # co19-roll r587: Please triage this failure