Squash commits for public release

libs/libobjc/src/memory.mm

@@ -0,0 +1,9 @@
+#include <libobjc/memory.h>
+
+id alloc_instance(Class cls)
+{
+    size_t sz = cls->size();
+    id obj = (id)objc_malloc(sz);
+    obj->set_isa(cls);
+    return obj;
+}