Disable UseOfMemberOfNullReference issue. It's currently too unstable and performance-hungry.

src/AddIns/BackendBindings/CSharpBinding/Project/CSharpBinding.addin

@@ -363,7 +363,6 @@
 		<Class class = "ICSharpCode.NRefactory.CSharp.Refactoring.UseIsOperatorIssue" />
 		<Class class = "ICSharpCode.NRefactory.CSharp.Refactoring.UseMethodAnyIssue" />
 		<Class class = "ICSharpCode.NRefactory.CSharp.Refactoring.UseMethodIsInstanceOfTypeIssue" />
-		<Class class = "ICSharpCode.NRefactory.CSharp.Refactoring.UseOfMemberOfNullReference" />
 		<Class class = "ICSharpCode.NRefactory.CSharp.Refactoring.ValueParameterNotUsedIssue" />
 		<Class class = "ICSharpCode.NRefactory.CSharp.Refactoring.XmlDocIssue" />
 	</Path>

src/Libraries/NRefactory/ICSharpCode.NRefactory.CSharp.Refactoring/CodeIssues/Uncategorized/UseOfMemberOfNullReference.cs

@@ -34,10 +34,10 @@ using ICSharpCode.NRefactory.CSharp.Analysis;
 
 namespace ICSharpCode.NRefactory.CSharp.Refactoring
 {
-	[IssueDescription("Use of (non-extension method) member of null value will cause a NullReferenceException",
+//	[IssueDescription("Use of (non-extension method) member of null value will cause a NullReferenceException",
-	                  Description = "Detects when a member of a null value is used",
+//	                  Description = "Detects when a member of a null value is used",
-	                  Category = IssueCategories.CodeQualityIssues,
+//	                  Category = IssueCategories.CodeQualityIssues,
-	                  Severity = Severity.Warning)]
+//	                  Severity = Severity.Warning)]
 	public class UseOfMemberOfNullReference : GatherVisitorCodeIssueProvider
 	{
 		static readonly ISet<NullValueStatus> ProblematicNullStates = new HashSet<NullValueStatus> {