Reworked per-Abi vtable code to correctly handle all platforms.

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -1397,16 +1397,10 @@ namespace CppSharp.Generators.CSharp
             WriteLine("if (__ManagedVTables == null)");
             WriteStartBraceIndent();
 
-            switch (Driver.Options.Abi)
+            if (Options.IsMicrosoftAbi)
-            {
-                case CppAbi.Microsoft:
                 AllocateNewVTablesMS(@class, entries, wrappedEntries);
-                    break;
+            else
-                case CppAbi.Itanium:
-                case CppAbi.ARM:
                 AllocateNewVTablesItanium(@class, entries, wrappedEntries);
-                    break;
-            }
 
             WriteCloseBraceIndent();
             NewLine();
@@ -1663,9 +1657,8 @@ namespace CppSharp.Generators.CSharp
 
         public void GenerateVTablePointers(Class @class)
         {
-            switch (Driver.Options.Abi)
+            if (Options.IsMicrosoftAbi)
             {
-                case CppAbi.Microsoft:
                 var index = 0;
                 foreach (var info in @class.Layout.VFTables)
                 {
@@ -1676,16 +1669,15 @@ namespace CppSharp.Generators.CSharp
 
                     PopBlock(NewLineKind.BeforeNextBlock);
                 }
-                    break;
+            }
-                case CppAbi.Itanium:
+            else
-                case CppAbi.ARM:
+            {
                 PushBlock(CSharpBlockKind.InternalsClassField);
 
                 WriteLine("[FieldOffset(0)]");
                 WriteLine("public global::System.IntPtr vfptr0;");
 
                 PopBlock(NewLineKind.BeforeNextBlock);
-                    break;
             }
         }