Fix #3353: Normal method is decompiled as lambda expression.

ICSharpCode.Decompiler.Tests/TestCases/Pretty/DelegateConstruction.cs

@@ -40,6 +40,7 @@ namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty.DelegateConstruction
 		[CompilerGenerated]
 		internal class Helper
 		{
+			[CompilerGenerated]
 			internal bool HelpMe(Dummy dum)
 			{
 				return true;

ICSharpCode.Decompiler/IL/Transforms/DelegateConstruction.cs

@@ -115,7 +115,7 @@ namespace ICSharpCode.Decompiler.IL.Transforms
 				return false;
 			if (!(method.HasGeneratedName()
 				|| method.Name.Contains("$")
-				|| method.IsCompilerGeneratedOrIsInCompilerGeneratedClass()
+				|| method.IsCompilerGenerated()
 				|| TransformDisplayClassUsage.IsPotentialClosure(
 					decompiledTypeDefinition, method.DeclaringTypeDefinition)
 				|| ContainsAnonymousType(method)))