Remove `Layout.GetSize()` method as it's no longer relevant (#1474)

src/AST/ClassExtensions.cs

@@ -214,11 +214,6 @@ namespace CppSharp.AST
                 b => b.Class).Any(HasDependentValueFieldInLayout);
         }
 
-        public static int GetSize(this ClassLayout layout) =>
-            /// There's at least one ABI (System V) that gives to empty structs
-            /// size 1 in C++ and size 0 in C. The former causes crashes in older versions of Mono.
-            layout.Size == 1 && layout.DataSize == 0 ? 0 : layout.Size;
-
         private static bool IsValueDependent(Type type)
         {
             var desugared = type.Desugar();

src/Generator/Generators/CSharp/CSharpSources.cs

@@ -535,11 +535,11 @@ namespace CppSharp.Generators.CSharp
 
             PushBlock(BlockKind.InternalsClass);
 
-            if (@class.Layout.GetSize() > 0)
+            if (@class.Layout.Size > 0)
             { 
                 var layout = sequentialLayout ? "Sequential" : "Explicit";
                 var pack = @class.MaxFieldAlignment > 0 ? $", Pack = {@class.MaxFieldAlignment}" : string.Empty;
-                WriteLine($"[StructLayout(LayoutKind.{layout}, Size = {@class.Layout.GetSize()}{pack})]");
+                WriteLine($"[StructLayout(LayoutKind.{layout}, Size = {@class.Layout.Size}{pack})]");
             }
 
             GenerateClassInternalHead(@class);
@@ -3035,7 +3035,7 @@ internal static{(@new ? " new" : string.Empty)} {printedClass} __GetInstance({Ty
                 ((Method) method.OriginalFunction).IsConstructor)
             {
                 WriteLine($@"Marshal.AllocHGlobal({
-                    ((Class) method.OriginalNamespace).Layout.GetSize()});");
+                    ((Class) method.OriginalNamespace).Layout.Size});");
                 names.Insert(0, Helpers.ReturnIdentifier);
             }
             WriteLine("{0}({1});", functionName, string.Join(", ", names));

src/Generator/Generators/CSharp/CSharpTypePrinter.cs

@@ -91,12 +91,8 @@ namespace CppSharp.Generators.CSharp
                         $"[{array.Size}]");
                 }
 
-                Class @class;
-                if (arrayType.TryGetClass(out @class))
-                {
-                    return new TypePrinterResult($"fixed byte",
-                        $"[{array.Size * @class.Layout.GetSize()}]");
-                }
+                if (arrayType.IsClass())
+                    return new TypePrinterResult($"fixed byte", $"[{array.GetSizeInBytes()}]");
 
                 TypePrinterResult arrayElemType = array.QualifiedType.Visit(this);