Issue 4785. Fix for resolving label for block in switch/case

compiler/java/com/google/dart/compiler/resolver/Resolver.java

Index: compiler/java/com/google/dart/compiler/resolver/Resolver.java
diff --git a/compiler/java/com/google/dart/compiler/resolver/Resolver.java b/compiler/java/com/google/dart/compiler/resolver/Resolver.java
index 767202d929d236d3b2b85d7d60a8c037d2f3f9bf..8627595d56ea43740d3b50237991495fdeee020e 100644
--- a/compiler/java/com/google/dart/compiler/resolver/Resolver.java
+++ b/compiler/java/com/google/dart/compiler/resolver/Resolver.java
@@ -783,11 +783,12 @@ public class Resolver {
     @Override
     public Element visitLabel(DartLabel x) {
       DartNode parent = x.getParent();
-      if (!(parent instanceof DartSwitchMember)) {
+      if (!(parent instanceof DartSwitchMember && ((DartSwitchMember) parent).getLabels().contains(
+          x))) {
         LabelElement labelElement;
         DartStatement childStatement = x.getStatement();
         while (childStatement instanceof DartLabel) {
-          childStatement = ((DartLabel)childStatement).getStatement();
+          childStatement = ((DartLabel) childStatement).getStatement();
         }
         if (childStatement instanceof DartSwitchStatement) {
           labelElement = Elements.switchLabelElement(x, x.getName(), innermostFunction);