dart2dart: Support for all constants in new backend.

sdk/lib/_internal/compiler/implementation/dart_backend/tree_tracer.dart

Index: sdk/lib/_internal/compiler/implementation/dart_backend/tree_tracer.dart
diff --git a/sdk/lib/_internal/compiler/implementation/dart_backend/tree_tracer.dart b/sdk/lib/_internal/compiler/implementation/dart_backend/tree_tracer.dart
index 6bd8ff4522b289f42248763b2339204b3c93569b..07886f8be2cb7b1734bef58d416c06513d792099 100644
--- a/sdk/lib/_internal/compiler/implementation/dart_backend/tree_tracer.dart
+++ b/sdk/lib/_internal/compiler/implementation/dart_backend/tree_tracer.dart
@@ -61,7 +61,6 @@ class BlockCollector extends Visitor {
   visitConcatenateStrings(ConcatenateStrings node) {}
   visitLiteralList(LiteralList node) {}
   visitLiteralMap(LiteralMap node) {}
-  visitInvokeConstConstructor(InvokeConstConstructor node) {}
   visitConstant(Constant node) {}
   visitConditional(Conditional node) {}
   visitLogicalOperator(LogicalOperator node) {}
@@ -312,7 +311,8 @@ class SubexpressionVisitor extends ExpressionVisitor<String> {
       callName = '${node.type}.${node.target.name}';
     }
     String args = formatArguments(node);
-    return "new $callName($args)";
+    String keyword = node.constant != null ? 'const' : 'new';
+    return "$keyword $callName($args)";
   }
 
   String visitConcatenateStrings(ConcatenateStrings node) {
@@ -335,17 +335,6 @@ class SubexpressionVisitor extends ExpressionVisitor<String> {
     return "map [${entries.join(', ')}]";
   }
 
-  String visitInvokeConstConstructor(InvokeConstConstructor node) {
-    String callName;
-    if (node.target.name.isEmpty) {
-      callName = '${node.type}';
-    } else {
-      callName = '${node.type}.${node.target.name}';
-    }
-    String arguments = node.arguments.map(visitExpression).join(', ');
-    return "const $callName($arguments)";
-  }
-
   String visitConstant(Constant node) {
     return "${node.value}";
   }