added new functionId and created IntervalTree.Empty (changeset 1374498)

Src/Workspaces/Core/Portable/Log/FunctionId.cs

@@ -293,5 +293,7 @@ internal enum FunctionId
         SymbolFinder_Project_Name_FindSourceDeclarationsAsync,
         SymbolFinder_Solution_Predicate_FindSourceDeclarationsAsync,
         SymbolFinder_Project_Predicate_FindSourceDeclarationsAsync,
+        Tagger_Diagnostics_RecomputeTags,
+        Tagger_Diagnostics_Updated,
     }
 }
\ No newline at end of file

Src/Workspaces/Core/Portable/Log/FunctionIdOptions.cs

@@ -42,6 +42,10 @@ private static bool GetDefaultValue(FunctionId id)
                 case FunctionId.Tagger_ReferenceHighlighting_TagProducer_ProduceTags:
                     return false;
 
+                case FunctionId.Tagger_Diagnostics_RecomputeTags:
+                case FunctionId.Tagger_Diagnostics_Updated:
+                    return false;
+
                 case FunctionId.Workspace_SourceText_GetChangeRanges:
                 case FunctionId.Workspace_Recoverable_RecoverRootAsync:
                 case FunctionId.Workspace_Recoverable_RecoverRoot:

Src/Workspaces/Core/Portable/Shared/Collections/IntervalTree`1.cs

@@ -14,6 +14,8 @@ namespace Microsoft.CodeAnalysis.Shared.Collections
     /// </summary>
     internal partial class IntervalTree<T> : IEnumerable<T>
     {
+        public static readonly IntervalTree<T> Empty = new IntervalTree<T>();
+
         protected Node root;
 
         private delegate bool TestInterval(T value, int start, int length, IIntervalIntrospector<T> introspector, bool skipZeroLengthIntervals);