Added support for clearing declarations between visits and fixed some passes that need it.

src/Generator/Passes/CheckDuplicatedNamesPass.cs

@@ -89,6 +89,7 @@ namespace CppSharp.Passes
 
         public CheckDuplicatedNamesPass()
         {
+            ClearVisitedDeclarations = false;
             names = new Dictionary<string, DeclarationName>();
         }
 

src/Generator/Passes/CheckOperatorsOverloads.cs

@@ -9,6 +9,11 @@ namespace CppSharp.Passes
     /// </summary>
     class CheckOperatorsOverloadsPass : TranslationUnitPass
     {
+        public CheckOperatorsOverloadsPass()
+        {
+            ClearVisitedDeclarations = false;
+        }
+
         public override bool VisitClassDecl(Class @class)
         {
             if (@class.CompleteDeclaration != null)

src/Generator/Passes/Pass.cs

@@ -17,6 +17,8 @@ namespace CppSharp.Passes
             get { return Driver.Diagnostics; }
         }
 
+        public bool ClearVisitedDeclarations = false;
+
         public virtual bool VisitLibrary(ASTContext context)
         {
             AstContext = context;
@@ -34,6 +36,9 @@ namespace CppSharp.Passes
             if (unit.IsSystemHeader)
                 return false;
 
+            if (ClearVisitedDeclarations)
+                Visited.Clear();
+
             VisitDeclarationContext(unit);
 
             return true;