Always visit initializing constants.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index 1e03d331dc3579f3748e1b682b2a371efab11199..c4d7715d671db4d95a54906e1b6f339296e3123b 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -450,9 +450,9 @@ class ResolverTask extends CompilerTask {
 
     SendSet send = tree.asSendSet();
     if (send != null) {
-      if (!compiler.analyzeSignaturesOnly) {
-        visitor.visit(send.arguments.head);
-      }
+      // TODO(johnniwinther): Avoid analyzing initializers if
+      // [Compiler.analyzeSignaturesOnly] is set.
+      visitor.visit(send.arguments.head);
     } else if (element.modifiers.isConst()) {
       compiler.reportError(element, MessageKind.CONST_WITHOUT_INITIALIZER);
     }