Support map and list literals in analyzer2dart.

sdk/lib/_internal/compiler/implementation/cps_ir/cps_ir_builder_visitor.dart

Index: sdk/lib/_internal/compiler/implementation/cps_ir/cps_ir_builder_visitor.dart
diff --git a/sdk/lib/_internal/compiler/implementation/cps_ir/cps_ir_builder_visitor.dart b/sdk/lib/_internal/compiler/implementation/cps_ir/cps_ir_builder_visitor.dart
index 9b20c5e6f4031be1c5404f937df7afe2ca576f29..80df4d3c5b0c786eb2f0a52437241da48607d735 100644
--- a/sdk/lib/_internal/compiler/implementation/cps_ir/cps_ir_builder_visitor.dart
+++ b/sdk/lib/_internal/compiler/implementation/cps_ir/cps_ir_builder_visitor.dart
@@ -683,32 +683,26 @@ class IrBuilderVisitor extends ResolvedVisitor<ir.Primitive>
   }
 
   ir.Primitive visitLiteralList(ast.LiteralList node) {
-    assert(irBuilder.isOpen);
     if (node.isConst) {
       return translateConstant(node);
     }
     List<ir.Primitive> values = node.elements.nodes.mapToList(visit);
-    GenericType type = elements.getType(node);
-    ir.Primitive result = new ir.LiteralList(type, values);
-    irBuilder.add(new ir.LetPrim(result));
-    return result;
+    InterfaceType type = elements.getType(node);
+    return irBuilder.buildListLiteral(type, values);
   }
 
   ir.Primitive visitLiteralMap(ast.LiteralMap node) {
-    assert(irBuilder.isOpen);
     if (node.isConst) {
       return translateConstant(node);
     }
+    InterfaceType type = elements.getType(node);
     List<ir.Primitive> keys = new List<ir.Primitive>();
     List<ir.Primitive> values = new List<ir.Primitive>();
     node.entries.nodes.forEach((ast.LiteralMapEntry node) {
       keys.add(visit(node.key));
       values.add(visit(node.value));
     });
-    GenericType type = elements.getType(node);
-    ir.Primitive result = new ir.LiteralMap(type, keys, values);
-    irBuilder.add(new ir.LetPrim(result));
-    return result;
+    return irBuilder.buildMapLiteral(type, keys, values);
   }
 
   ir.Primitive visitLiteralSymbol(ast.LiteralSymbol node) {