dart2js: capture type variables in closures, if they are only used in literals.

pkg/compiler/lib/src/closure.dart

Index: pkg/compiler/lib/src/closure.dart
diff --git a/pkg/compiler/lib/src/closure.dart b/pkg/compiler/lib/src/closure.dart
index 46219a33ac29ccc264bde6431b51024c7609aa6c..93e7bb2c2b87e60d99bc6d8ac0dcad80f3a7c8c9 100644
--- a/pkg/compiler/lib/src/closure.dart
+++ b/pkg/compiler/lib/src/closure.dart
@@ -731,6 +731,18 @@ class ClosureTranslator extends Visitor {
     node.visitChildren(this);
   }
 
+  visitLiteralList(LiteralList node) {
+    DartType type = elements.getType(node);
+    analyzeType(type);
+    node.visitChildren(this);
+  }
+
+  visitLiteralMap(LiteralMap node) {
+    DartType type = elements.getType(node);
+    analyzeType(type);
+    node.visitChildren(this);
+  }
+
   void analyzeTypeVariables(DartType type) {
     type.forEachTypeVariable((TypeVariableType typeVariable) {
       // Field initializers are inlined and access the type variable as