Handle compile-time constness for conditionals and type literal calls.

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 == jsshell ]
 LibTest/isolate/isolate_api/spawnUri_A02_t01: Crash # TODO(ahe): Please triage this crash.
 LibTest/core/List/sort_A01_t04: Fail, Pass, Timeout # Must be a bug in jsshell, test sometimes times out.
 
 [ $compiler == dart2js && $checked && $runtime == ie9 ]
 LibTest/core/Uri/encodeQueryComponent_A01_t02: Pass, Timeout # co19-roll r576: Please triage this failure
@@ skipping 108 matching lines @@
 Language/07_Classes/6_Constructors/1_Generative_Constructors_A13_t01: RuntimeError, OK # These tests need to be updated for new optional parameter syntax and semantics, co19 issue 258:
 
 LibTest/isolate/SendPort/send_A02_t04: RuntimeError, Pass, OK # co19 issue 293 Passes on IE
 
 LibTest/core/RegExp/firstMatch_A01_t01: RuntimeError, OK # co19 issue 294
 LibTest/core/RegExp/Pattern_semantics/firstMatch_Term_A04_t01: RuntimeError, OK # co19 issue 294
 
 LibTest/core/int/isOdd_A01_t01: RuntimeError, OK # co19 issue 277
 LibTest/core/int/isEven_A01_t01: RuntimeError, OK # co19 issue 277
 
+Language/12_Expressions/01_Constants_A15_t16: MissingCompileTimeError # co19 Issue 593
+
 [ $compiler == dart2js ]
 LibTest/isolate/IsolateSink/add_A01_t01: CompileTimeError # Issue 13683
 LibTest/isolate/SendPort/send_A02_t01: CompileTimeError # Issue 13683
 
 LibTest/isolate/isolate_api/spawnUri_A02_t01: RuntimeError # Runtime error: Expect.throws() fails
 LibTest/isolate/isolate_api/spawnUri_A01_t01: RuntimeError # Runtime error: UnsupportedError: Currently spawnUri is not supported without web workers.
 LibTest/isolate/isolate_api/spawnUri_A01_t02: RuntimeError # Runtime error: UnsupportedError: Currently spawnUri is not supported without web workers.
 LibTest/isolate/isolate_api/spawnUri_A01_t03: RuntimeError # Runtime error: UnsupportedError: Currently spawnUri is not supported without web workers.
 LibTest/isolate/isolate_api/spawnUri_A01_t04: RuntimeError # Runtime error: UnsupportedError: Currently spawnUri is not supported without web workers.
 LibTest/isolate/isolate_api/spawnUri_A01_t05: RuntimeError # Runtime error: UnsupportedError: Currently spawnUri is not supported without web workers.
@@ skipping 169 matching lines @@
 
 
 [ $compiler == dart2js && ($runtime == ie10 || $runtime == ff || $runtime == chrome || $runtime == drt || $runtime == safari || $runtime == opera) ]
 *: Skip
 
 #
 # Missing compile-time errors.
 #
 [ $compiler == dart2js ]
 Language/07_Classes/07_Classes_A02_t11: MissingCompileTimeError # 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: MissingCompileTimeError # 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: MissingCompileTimeError # 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: MissingCompileTimeError # 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: MissingCompileTimeError # Checks that multi-line strings that contain characters and sequences prohibited by this grammar, cause compile-time errors.
 Language/16_Reference/1_Lexical_Rules/1_Reserved_Words_A40_t04: MissingCompileTimeError # Checks that other Unicode whitespaces are not allowed:  check NO-BREAK SPACE (U+00A0)
 Language/16_Reference/1_Lexical_Rules_A02_t06: MissingCompileTimeError # Checks that Unicode whitespaces other than WHITESPACE are not permitted in the source code. Checks symbol U+00a0.
 
 
 #
 # Unexpected compile-time errors.
 #
@@ skipping 290 matching lines @@
 Language/10_Generics/09_Generics_A01_t17: fail # co19-roll r587: Please triage this failure
 
 [ $compiler == dart2js ]
 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/json/printOn_A01_t01: fail # co19-roll r587: Please triage this failure
 LibTest/json/printOn_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