Fixed an issue in unit tests where the `RefFields` type would be decompiled into incorrect code when the return value of the `IsPrimaryConstructor` function was forcibly changed to `false`.

ICSharpCode.Decompiler/CSharp/Transforms/TransformFieldAndConstructorInitializers.cs

@@ -230,6 +230,10 @@ namespace ICSharpCode.Decompiler.CSharp.Transforms
 					if (initializer.DescendantsAndSelf.Any(n => n is ThisReferenceExpression || n is BaseReferenceExpression))
 						break;
 					var v = initializer.Annotation<ILVariableResolveResult>()?.Variable;
+					if (v == null)
+					{
+						v = (initializer.Annotation<ByReferenceResolveResult>()?.ElementResult as ILVariableResolveResult)?.Variable;
+					}
 					if (v?.Kind == IL.VariableKind.Parameter)
 					{
 						isStructPrimaryCtor = record?.PrimaryConstructor != null;