Support general expressions as keys in literal maps.

tests/co19/co19-dart2dart.status

Index: tests/co19/co19-dart2dart.status
diff --git a/tests/co19/co19-dart2dart.status b/tests/co19/co19-dart2dart.status
index 91b835e7c554c4b29863f7a83103a24c455e4da4..7de53374481dfd456b5ff210c8df2d10f8fbc0e3 100644
--- a/tests/co19/co19-dart2dart.status
+++ b/tests/co19/co19-dart2dart.status
@@ -66,6 +66,7 @@ Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t01: Fail # inher
 Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t02: Fail # inherited from VM
 Language/07_Classes/6_Constructors/3_Constant_Constructors_A05_t03: Fail # inherited from VM
 Language/07_Classes/6_Constructors_A02_t01: Fail # http://dartbug.com/5519
+Language/12_Expressions/07_Maps_A12_t03: Fail # http://dartbug.com/5519
 LibTest/core/Match/operator_subscript_A01_t01: Fail # inherited from VM
 LibTest/core/Match/operator_subscript_A01_t01: Fail, OK # co19 issue 294
 LibTest/core/RegExp/Pattern_semantics/firstMatch_Atom_A02_t01: Fail # inherited from VM
@@ -140,7 +141,6 @@ Language/07_Classes/4_Abstract_Instance_Members_A03_t02: Fail # co19-roll r559:
 Language/07_Classes/4_Abstract_Instance_Members_A03_t03: Fail # co19-roll r559: Please triage this failure
 Language/07_Classes/4_Abstract_Instance_Members_A03_t04: Fail # co19-roll r559: Please triage this failure
 Language/07_Classes/4_Abstract_Instance_Members_A03_t05: Fail # co19-roll r559: Please triage this failure
-Language/12_Expressions/00_Object_Identity/1_Object_Identity_A04_t02: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/01_Constants_A03_t02: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/01_Constants_A03_t03: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/01_Constants_A03_t04: fail # co19-roll r546: Please triage this failure
@@ -193,16 +193,9 @@ Language/12_Expressions/05_Strings_A02_t48: fail # co19-roll r546: Please triage
 Language/12_Expressions/05_Strings_A20_t01: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/06_Lists_A03_t01: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/06_Lists_A03_t02: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A01_t01: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/07_Maps_A02_t01: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/07_Maps_A02_t02: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A08_t02: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/07_Maps_A12_t01: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A12_t02: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A12_t04: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A12_t05: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A12_t06: fail # co19-roll r546: Please triage this failure
-Language/12_Expressions/07_Maps_A12_t07: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/12_Instance_Creation/1_New_A02_t03: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/12_Instance_Creation/1_New_A02_t05: fail # co19-roll r546: Please triage this failure
 Language/12_Expressions/12_Instance_Creation/1_New_A02_t06: fail # co19-roll r546: Please triage this failure