Use reference rather than pointer for destructor calling.

This avoids the issue with overloaded address-of operators.

Cython/Compiler/ModuleNode.py

@@ -1345,7 +1345,7 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
             code.putln("if (p->__weakref__) PyObject_ClearWeakRefs(o);")
 
         for entry in cpp_class_attrs:
-            code.putln("__Pyx_call_destructor(&p->%s);" % entry.cname)
+            code.putln("__Pyx_call_destructor(p->%s);" % entry.cname)
 
         for entry in py_attrs:
             code.put_xdecref_clear("p->%s" % entry.cname, entry.type, nanny=False,

Cython/Utility/ModuleSetupCode.c

@@ -248,8 +248,8 @@ typedef struct {
 
 // Work around clang bug http://stackoverflow.com/questions/21847816/c-invoke-nested-template-class-destructor
 template<typename T>
-void __Pyx_call_destructor(T* x) {
-    x->~T();
+void __Pyx_call_destructor(T& x) {
+    x.~T();
 }
 
 // Used for temporary variables of "reference" type.