[runtime] Implement mono_value_box for CoreCLR. (#11533)

runtime/coreclr-bridge.m

@@ -339,6 +339,14 @@ mono_object_isinst (MonoObject * obj, MonoClass * klass)
 	return rv ? obj : NULL;
 }
 
+MonoObject *
+mono_value_box (MonoDomain *domain, MonoClass *klass, void *val)
+{
+	MonoObject *rv = xamarin_bridge_box (klass, val);
+	LOG_CORECLR (stderr, "%s (%p, %p, %p) => %p\n", __func__, domain, klass, val, rv);
+	return rv;
+}
+
 void *
 mono_object_unbox (MonoObject *obj)
 {

runtime/delegates.t4

@@ -401,6 +401,15 @@
 			OnlyCoreCLR = true,
 		},
 
+		new XDelegate ("MonoObject *", "MonoObject *", "xamarin_bridge_box",
+			"MonoObject *", "MonoObject *", "typeobj",
+			"void *", "IntPtr", "value"
+		) {
+			WrappedManagedFunction = "Box",
+			OnlyDynamicUsage = false,
+			OnlyCoreCLR = true,
+		},
+
 		new XDelegate ("MonoObject*", "IntPtr", "xamarin_bridge_get_monoobject",
 			"GCHandle", "IntPtr", "gchandle"
 		) {

runtime/exports.t4

@@ -199,7 +199,9 @@
 			"MonoDomain *", "domain",
 			"MonoClass *", "klass",
 			"void *", "val"
-		),
+		) {
+			HasCoreCLRBridgeFunction = true,
+		},
 
 		new Export ("void", "mono_gc_wbarrier_set_arrayref",
 			"MonoArray *", "arr",