Minor: Unit.VALUE -> Unit in Java code.

compiler/frontend/src/org/jetbrains/jet/lang/cfg/JetFlowInformationProvider.java

@@ -957,7 +957,7 @@ public class JetFlowInformationProvider {
         @Override
         public Unit invoke(Instruction instruction, D enterData, D exitData) {
             execute(instruction, enterData, exitData);
-            return Unit.VALUE;
+            return Unit.instance$;
         }
 
         public abstract void execute(Instruction instruction, D enterData, D exitData);
@@ -967,7 +967,7 @@ public class JetFlowInformationProvider {
         @Override
         public Unit invoke(P p) {
             execute(p);
-            return Unit.VALUE;
+            return Unit.instance$;
         }
 
         public abstract void execute(P p);

compiler/frontend/src/org/jetbrains/jet/lang/cfg/PseudocodeVariablesData.java

@@ -85,7 +85,7 @@ public class PseudocodeVariablesData {
                     if (variableDescriptor != null) {
                         result.add(variableDescriptor);
                     }
-                    return Unit.VALUE;
+                    return Unit.instance$;
                 }
             });
             usedVariables = Collections.unmodifiableSet(result);

compiler/frontend/src/org/jetbrains/jet/lang/resolve/OverrideResolver.java

@@ -192,7 +192,7 @@ public class OverrideResolver {
                 if (element instanceof JetDeclaration) {
                     trace.report(CANNOT_INFER_VISIBILITY.on((JetDeclaration) element, descriptor));
                 }
-                return Unit.VALUE;
+                return Unit.instance$;
             }
         };
     }

compiler/frontend/src/org/jetbrains/jet/lang/resolve/lazy/descriptors/LazyClassDescriptor.java

@@ -515,7 +515,7 @@ public class LazyClassDescriptor extends ClassDescriptorBase implements ClassDes
                     @Override
                     public Unit invoke(@NotNull Supertypes supertypes) {
                         findAndDisconnectLoopsInTypeHierarchy(supertypes);
-                        return Unit.VALUE;
+                        return Unit.instance$;
                     }
                 }
         );