Revert "Performance: Don't look for implicit interface implementations if the...

Revert "Performance: Don't look for implicit interface implementations if the language doesn't support it."

This reverts commit b90f222e.

src/Features/Core/Portable/AddParameter/AbstractAddParameterCodeFixProvider.cs

@@ -202,12 +202,9 @@ private int NonParamsParameterCount(IMethodSymbol method)
                 var methodToUpdate = argumentInsertPositionData.MethodToUpdate;
                 var argumentToInsert = argumentInsertPositionData.ArgumentToInsert;
                 var parameters = methodToUpdate.Parameters.Select(p => p.ToDisplayString(SimpleFormat));
+
                 var title = GetCodeFixTitle(FeaturesResources.Add_parameter_to_0, methodToUpdate, parameters);
-                var methodSourceTree = methodToUpdate.Locations.Any() ? methodToUpdate.Locations[0].SourceTree : null;
-                var semanticFacts = methodSourceTree != null
-                    ? context.Document.Project.Solution.GetDocument(methodSourceTree).GetLanguageService<ISemanticFactsService>()
-                    : null;
-                var hasCascadingDeclarations = HasCascadingDeclarations(methodToUpdate, semanticFacts);
+                var hasCascadingDeclarations = HasCascadingDeclarations(methodToUpdate);
                 CodeAction codeAction = new MyCodeAction(title,
                     c => FixAsync(context.Document, methodToUpdate, argumentToInsert, arguments, fixAllReferences: false, c));
                 if (hasCascadingDeclarations)
@@ -232,7 +229,7 @@ private int NonParamsParameterCount(IMethodSymbol method)
         /// Checks if there are indications that there might be more than one declarations that need to be fixed.
         /// The check does not look-up if there are other declarations (this is done later in the CodeAction).
         /// </summary>
-        private bool HasCascadingDeclarations(IMethodSymbol method, ISemanticFactsService semanticFacts)
+        private bool HasCascadingDeclarations(IMethodSymbol method)
         {
             // Don't cascade constructors
             if (method.IsConstructor())
@@ -253,11 +250,6 @@ private bool HasCascadingDeclarations(IMethodSymbol method, ISemanticFactsServic
                 return true;
             }
 
-            if (semanticFacts?.SupportsImplicitInterfaceImplementation == false)
-            {
-                return false;
-            }
-
             // For implicit interface implementations lets check if the characteristic of the method
             // allows it to implicit implement an interface member.
             if (method.DeclaredAccessibility != Accessibility.Public)