Make sure the solution crawler is running in the VS workspace. (#14803)

Then I better merge quickly.  ;-)

If it makes it in, great, if not then I guess we'll just get it in RC.2.

src/VisualStudio/Xaml/Impl/Implementation/XamlProject.cs

@@ -24,6 +24,9 @@ internal class XamlProject : AbstractLegacyProject
                 hostDiagnosticUpdateSourceOpt: null)
         {
             projectTracker.AddProject(this);
+
+            // Make sure the solution crawler is running in this workspace
+            visualStudioWorkspace.StartSolutionCrawler();
         }
 
         private static string GetProjectName(IVsHierarchy hierarchy)