[runtime] Replace xamarin_try_get_nsobject with xamarin_has_nsobject.

Removes one usage of ObjectWrapper, since we don't actually need
the return value, we just need to know if an object exists.

runtime/delegates.t4

@@ -67,14 +67,14 @@
 			"SEL", "IntPtr", "sel"
 		) { WrappedManagedFunction = "GetMethodForSelector" },
 
-		new XDelegate ("MonoObject *", "IntPtr", "xamarin_try_get_nsobject",
-			"id", "IntPtr", "obj"
-		) { WrappedManagedFunction = "TryGetNSObjectWrapped" },
-
 		new XDelegate ("MonoObject *", "IntPtr", "xamarin_get_nsobject",
 			"id", "IntPtr", "obj"
 		) { WrappedManagedFunction = "GetNSObjectWrapped" },
 
+		new XDelegate ("bool", "bool", "xamarin_has_nsobject",
+			"id", "IntPtr", "obj"
+		) { WrappedManagedFunction = "HasNSObject" },
+
 		new XDelegate ("id", "IntPtr", "xamarin_get_handle_for_inativeobject",
 			"MonoObject *", "IntPtr", "obj"
 		) { WrappedManagedFunction = "GetHandleForINativeObject" },

runtime/trampolines-invoke.m

@@ -27,8 +27,7 @@ xamarin_invoke_trampoline (enum TrampolineType type, id self, SEL sel, iterator_
 	bool is_ctor = type == Tramp_Ctor;
 
 	if (is_ctor) {
-		void *obj = xamarin_try_get_nsobject (self);
-		if (obj != NULL) {
+		if (xamarin_has_nsobject (self)) {
 			self = xamarin_invoke_objc_method_implementation (self, sel, (IMP) xamarin_ctor_trampoline);
 			marshal_return_value (context, "|", sizeof (id), self, NULL, false, NULL);
 			return;

runtime/xamarin/runtime.h

@@ -172,7 +172,7 @@ MonoObject*					xamarin_get_selector						(SEL ptr);
 Class						xamarin_get_class_handle					(MonoObject *obj);
 SEL							xamarin_get_selector_handle					(MonoObject *obj);
 MethodDescription			xamarin_get_method_for_selector				(Class cls, SEL sel);
-MonoObject*					xamarin_try_get_nsobject 					(id obj);
+bool						xamarin_has_nsobject 						(id obj);
 MonoObject*					xamarin_get_nsobject 						(id obj);
 id							xamarin_get_handle_for_inativeobject		(MonoObject *obj);
 void						xamarin_unregister_nsobject					(id native_obj, MonoObject *managed_obj);

src/ObjCRuntime/Runtime.cs

@@ -517,16 +517,16 @@ namespace XamCore.ObjCRuntime {
 			return Registrar.GetMethodDescription (Class.Lookup (cls), sel);
 		}
 
-		static IntPtr TryGetNSObjectWrapped (IntPtr ptr)
-		{
-			return ObjectWrapper.Convert (TryGetNSObject (ptr));
-		}
-
 		static IntPtr GetNSObjectWrapped (IntPtr ptr)
 		{
 			return ObjectWrapper.Convert (TryGetNSObject (ptr, true));
 		}
 
+		static bool HasNSObject (IntPtr ptr)
+		{
+			return TryGetNSObject (ptr) != null;
+		}
+
 		static IntPtr GetHandleForINativeObject (IntPtr ptr)
 		{
 			return ((INativeObject) ObjectWrapper.Convert (ptr)).Handle;

tools/common/StaticRegistrar.cs

@@ -3186,7 +3186,7 @@ namespace XamCore.Registrar {
 			body.Unindent ();
 			
 			if (isCtor) {
-				body.WriteLine ("if (xamarin_try_get_nsobject (self)) {");
+				body.WriteLine ("if (xamarin_has_nsobject (self)) {");
 				body.WriteLine ("*call_super = true;");
 				body.WriteLine ("return self;");
 				body.WriteLine ("}");