Merge branch 'dev15.7.x' into merge-15.6.x-to-15.7.x

src/VisualStudio/Core/Def/Implementation/ProjectSystem/AbstractProject.cs

@@ -83,6 +83,8 @@ internal abstract partial class AbstractProject : ForegroundThreadAffinitizedObj
             }
         }
 
+        private readonly HashSet<(AbstractProject, MetadataReferenceProperties)> _projectsReferencingMe = new HashSet<(AbstractProject, MetadataReferenceProperties)>();
+        
         /// <summary>
         /// Maps from the output path of a project that was converted to
         /// </summary>

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

@@ -403,7 +403,7 @@ internal enum FunctionId
         MetadataOnlyImage_EmitFailure,
         LiveTableDataSource_OnDiagnosticsUpdated,
         Experiment_KeybindingsReset,
-
+        
         AbstractProject_SetIntelliSenseBuild,
         AbstractProject_Created,
         AbstractProject_PushedToWorkspace,