Fix removal of attributes injected by the legacy VB compiler

ICSharpCode.Decompiler.Tests/TestCases/VBPretty/YieldReturn.cs

@@ -1,8 +1,5 @@
 using System;
 using System.Collections.Generic;
-#if LEGACY_VBC
-using System.Diagnostics;
-#endif
 
 using Microsoft.VisualBasic.CompilerServices;
 
@@ -23,9 +20,6 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.VBPretty
 	{
 		private int fieldOnThis;
 
-#if LEGACY_VBC
-		[DebuggerStepThrough]
-#endif
 		public static IEnumerable<char> YieldChars {
 			get {
 				yield return 'a';

ICSharpCode.Decompiler/CSharp/CSharpDecompiler.cs

@@ -1807,6 +1807,10 @@ namespace ICSharpCode.Decompiler.CSharp
 				if (function.StateMachineCompiledWithLegacyVisualBasic)
 				{
 					RemoveAttribute(entityDecl, KnownAttribute.DebuggerStepThrough);
+					if (function.Method?.IsAccessor == true && entityDecl.Parent is EntityDeclaration parentDecl)
+					{
+						RemoveAttribute(parentDecl, KnownAttribute.DebuggerStepThrough);
+					}
 				}
 			}
 			if (function.IsAsync)