Imported Upstream version 5.16.0.112

Former-commit-id: 6cc2610f66eef3edea492b48d5312acef686f417

mcs/class/corlib/ReferenceSources/RuntimeType.cs

@@ -810,5 +810,20 @@ namespace System
 				return false;
 			}
 		}
+
+		[System.Runtime.InteropServices.ComVisible(true)]
+		[Pure]
+		public override bool IsSubclassOf(Type type)
+		{
+			if ((object)type == null)
+				throw new ArgumentNullException("type");
+			Contract.EndContractBlock();
+			RuntimeType rtType = type as RuntimeType;
+			if (rtType == null)
+				return false;
+
+			return RuntimeTypeHandle.IsSubclassOf (this, rtType);
+		}
+
 	}
 }

mcs/class/corlib/System/RuntimeTypeHandle.cs

@@ -250,5 +250,13 @@ namespace System
 		[MethodImplAttribute(MethodImplOptions.InternalCall)]
 		internal extern static IntPtr GetGenericParameterInfo (RuntimeType type);
 
+		internal static bool IsSubclassOf (RuntimeType childType, RuntimeType baseType)
+		{
+			return is_subclass_of (childType._impl.Value, baseType._impl.Value);
+		}
+
+		[MethodImplAttribute(MethodImplOptions.InternalCall)]
+		internal extern static bool is_subclass_of (IntPtr childType, IntPtr baseType);
+
 	}
 }

mcs/class/corlib/Test/System/TypeTest.cs.REMOVED.git-id

@@ -1 +1 @@
-744f1a217a1af896659e714634a6b4c7b8a08b5a
+80fe02b425454e3f5205fb0e48c932f6fbe95c5e