Fixed an analyzer crash caused by invalid type attributes

Extensions/dnSpy.Analyzer/TreeNodes/ScopedWhereUsedAnalyzer.cs

@@ -1,14 +1,14 @@
 // Copyright (c) 2011 AlphaSierraPapa for the SharpDevelop Team
-// 
+//
 // Permission is hereby granted, free of charge, to any person obtaining a copy of this
 // software and associated documentation files (the "Software"), to deal in the Software
 // without restriction, including without limitation the rights to use, copy, modify, merge,
 // publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
 // to whom the Software is furnished to do so, subject to the following conditions:
-// 
+//
 // The above copyright notice and this permission notice shall be included in all copies or
 // substantial portions of the Software.
-// 
+//
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 // INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
 // PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
@@ -190,6 +190,7 @@ public ScopedWhereUsedAnalyzer(IDsDocumentService documentService, FieldDef fiel
 			Accessibility result;
 			switch (type.Attributes & TypeAttributes.VisibilityMask) {
 			case TypeAttributes.NestedPublic:
+			case TypeAttributes.Public: // Invalid but sometimes emitted by obfuscators
 				result = Accessibility.Public;
 				break;
 			case TypeAttributes.NestedPrivate:
@@ -199,6 +200,7 @@ public ScopedWhereUsedAnalyzer(IDsDocumentService documentService, FieldDef fiel
 				result = Accessibility.Family;
 				break;
 			case TypeAttributes.NestedAssembly:
+			case TypeAttributes.NotPublic: // Invalid but sometimes emitted by obfuscators
 				result = Accessibility.Internal;
 				break;
 			case TypeAttributes.NestedFamANDAssem: