Merge pull request #8561 from heejaechang/formatsymbol2

address more PR feedback.

src/Compilers/VisualBasic/Portable/SymbolDisplay/CustomSymbolDisplayFormatter.vb

@@ -126,19 +126,5 @@ Namespace Microsoft.CodeAnalysis.VisualBasic
         Public Shared Function DefaultErrorFormat(symbol As Symbol) As FormattedSymbol
             Return New FormattedSymbol(symbol, SymbolDisplayFormat.VisualBasicErrorMessageFormat)
         End Function
-
-        Public Shared Function DefaultErrorFormatIfSpecialType(arg As Object) As Object
-
-            Dim symbol = TryCast(arg, Symbol)
-            If symbol Is Nothing Then
-                Return arg
-            End If
-
-            If TypeOf symbol Is TypeSymbol AndAlso DirectCast(symbol, TypeSymbol).SpecialType <> SpecialType.None Then
-                Return DefaultErrorFormat(symbol)
-            End If
-
-            Return symbol
-        End Function
     End Class
 End Namespace

src/Compilers/VisualBasic/Portable/Symbols/MissingMetadataTypeSymbol.vb

@@ -50,7 +50,8 @@ Namespace Microsoft.CodeAnalysis.VisualBasic.Symbols
                 Dim containingAssembly As AssemblySymbol = Me.ContainingAssembly
 
                 If containingAssembly.IsMissing Then
-                    Return ErrorFactory.ErrorInfo(ERRID.ERR_UnreferencedAssembly3, containingAssembly.Identity, CustomSymbolDisplayFormatter.DefaultErrorFormatIfSpecialType(Me))
+                    Dim arg = If(Me.SpecialType <> SpecialType.None, DirectCast(CustomSymbolDisplayFormatter.DefaultErrorFormat(Me), Object), Me)
+                    Return ErrorFactory.ErrorInfo(ERRID.ERR_UnreferencedAssembly3, containingAssembly.Identity, arg)
                 Else
                     Dim containingModule As ModuleSymbol = Me.ContainingModule