fix decompilation of simple base/this ctor initializers

ICSharpCode.Decompiler/CSharp/ExpressionBuilder.cs

@@ -106,8 +106,9 @@ namespace ICSharpCode.Decompiler.CSharp
 
 		ExpressionWithResolveResult ConvertField(IField field, ILInstruction target = null)
 		{
-			return new MemberReferenceExpression(TranslateTarget(field, target, true), field.Name)
-				.WithRR(new ResolveResult(field.ReturnType));
+			var targetExpression = TranslateTarget(field, target, true);
+			return new MemberReferenceExpression(targetExpression, field.Name)
+				.WithRR(new MemberResolveResult(targetExpression.ResolveResult, field));
 		}
 		
 		TranslatedExpression IsType(IsInst inst)

NRefactory

@@ -1 +1 @@
-Subproject commit 0da9b3d110d3b3a9e08807d4d1157dc7d718515a
+Subproject commit c57d52dd02bc0a01815bb9313f4505d92cf75525