Fix YieldReturnDecompiler.

ICSharpCode.Decompiler/IL/ControlFlow/YieldReturnDecompiler.cs

@@ -453,6 +453,7 @@ namespace ICSharpCode.Decompiler.IL.ControlFlow
 			MethodDefinitionHandle getEnumeratorMethod = metadata.GetTypeDefinition(enumeratorType).GetMethods().FirstOrDefault(
 				m => metadata.GetString(metadata.GetMethodDefinition(m).Name).StartsWith("System.Collections.Generic.IEnumerable", StringComparison.Ordinal)
 				&& metadata.GetString(metadata.GetMethodDefinition(m).Name).EndsWith(".GetEnumerator", StringComparison.Ordinal));
+			ResolveIEnumerableIEnumeratorFieldMapping(getEnumeratorMethod, context, fieldToParameterMap);
 		}
 
 		internal static void ResolveIEnumerableIEnumeratorFieldMapping(MethodDefinitionHandle getEnumeratorMethod, ILTransformContext context,