Reuse the existing TSAB.

ICSharpCode.Decompiler/CSharp/CSharpDecompiler.cs

@@ -397,7 +397,7 @@ namespace ICSharpCode.Decompiler.CSharp
 			return new DecompilerTypeSystem(file, resolver);
 		}
 
-		internal static TypeSystemAstBuilder CreateAstBuilder(ITypeResolveContext decompilationContext)
+		static TypeSystemAstBuilder CreateAstBuilder(ITypeResolveContext decompilationContext)
 		{
 			var typeSystemAstBuilder = new TypeSystemAstBuilder();
 			typeSystemAstBuilder.ShowAttributes = true;

ICSharpCode.Decompiler/CSharp/CallBuilder.cs

@@ -1299,9 +1299,6 @@ namespace ICSharpCode.Decompiler.CSharp
 					.WithRR(result);
 				targetExpression = ide;
 			}
-			if (target.ResolveResult != null) {
-				result = new MemberResolveResult(target.ResolveResult, method);
-			}
 			var oce = new ObjectCreateExpression(expressionBuilder.ConvertType(inst.Method.DeclaringType), targetExpression)
 				.WithILInstruction(inst)
 				.WithRR(new ConversionResolveResult(

ICSharpCode.Decompiler/CSharp/StatementBuilder.cs

@@ -962,11 +962,10 @@ namespace ICSharpCode.Decompiler.CSharp
 			LocalFunctionDeclarationStatement TranslateFunction(ILFunction function)
 			{
 				var stmt = new LocalFunctionDeclarationStatement();
-				var tsab = CSharpDecompiler.CreateAstBuilder(null);
 				var nestedBuilder = new StatementBuilder(typeSystem, exprBuilder.decompilationContext, function, settings, cancellationToken);
 				stmt.Name = function.Name;
 				stmt.Parameters.AddRange(exprBuilder.MakeParameters(function.Parameters, function));
-				stmt.ReturnType = tsab.ConvertType(function.Method.ReturnType);
+				stmt.ReturnType = exprBuilder.ConvertType(function.Method.ReturnType);
 				stmt.Body = nestedBuilder.ConvertAsBlock(function.Body);
 				stmt.AddAnnotation(new MemberResolveResult(null, function.ReducedMethod));
 				return stmt;