Avoid cyclic computations in compile-time constants.

tests/co19/co19-leg.status

 # Copyright (c) 2011, 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.
 
 [ $component == leg && $system == macos ]
 LibTest/core/Math/acos_A01_t01: Fail
 LibTest/core/Math/asin_A01_t01: Fail
 LibTest/core/Math/atan_A01_t01: Fail
 
 
@@ skipping 109 matching lines @@
 Language/13_Types/2_Dynamic_Type_System_A02_t01: Fail # TODO(ahe): New co19 failure, please triage.
 LibTest/core/double/toStringAsFixed_A01_t03: Fail # TODO(ahe): New co19 failure, please triage.
 
 
 # Time outs on the bots.
 LibTest/core/List/sort_A01_t05: Skip # Times out.
 LibTest/core/List/sort_A01_t06: Skip # Times out.
 LibTest/core/List/sort_A01_t04: Skip # Times out.
 
 
-Language/10_Expressions/01_Constants_A17_t03: Crash # Cycle reference.
-Language/10_Expressions/01_Constants_A17_t02: Skip # Cyclic reference. Times out.
-Language/10_Expressions/01_Constants_A17_t01: Skip # Cyclic reference. Times out.
-
-
 # Issues with co19 test suite.
 Language/10_Expressions/07_Maps_A01_t01: Fail, OK # Bad test: an expression statement cannot start with a map literal (specification bug).
 Language/11_Statements/02_Expression_Statements_A01_t05: Fail, OK # Bad test: an expression statement cannot start with a map literal (specification bug).
 Language/11_Statements/02_Expression_Statements_A01_t07: Fail, OK # Bad test: an expression statement cannot start with a map literal (specification bug).
 Language/11_Statements/09_Try_A02_t04: Fail, OK # Bad test: Unbalanced {.
 Language/11_Statements/10_Return_A02_t01: Fail, OK # co19 issue 87.
 LibTest/core/Date/Date.fromString_A01_t02: Fail, OK # co19 issue 88.
 LibTest/core/Date/Date.fromString_A01_t04: Fail, OK # co19 issue 88.
 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.
@@ skipping 462 matching lines @@
 Language/11_Statements/10_Return_A04_t03: Fail, OK # @compile-error
 Language/11_Statements/11_Labels_A03_t05: Fail, OK # @compile-error
 Language/11_Statements/15_Assert_A01_t05: Fail, OK # @compile-error
 Language/13_Types/1_Static_Types_A02_t08: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t01: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t02: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t03: Fail, OK # @compile-error
 Language/13_Types/3_Type_Declarations/1_Typedef_A06_t04: Fail, OK # @compile-error
 Language/13_Types/7_Type_Void_A01_t02: Fail, OK # @compile-error
 Language/13_Types/7_Type_Void_A01_t09: Fail, OK # @compile-error