xo-interpreter adds + explict mm arg to ctors (retiring Object::mm)

include/xo/alloc/GC.hpp

@@ -54,6 +54,8 @@ namespace xo {
             bool allow_incremental_gc_ = true;
             /** true to report statistics **/
             bool stats_flag_ = false;
+            /** true to capture per-type object statistics **/
+            bool object_stats_flag_ = false;
             /** remember basic gc statistics for this many GC's; separately for incremental + full GCs **/
             std::size_t stats_history_z_ = 256;
             /** true to enable debug logging **/

include/xo/alloc/Object.hpp

@@ -258,8 +258,9 @@ namespace xo {
      **/
     class Cpof {
     public:
-        explicit Cpof(const Object * src) : src_{src} {}
+        explicit Cpof(gc::IAlloc * mm, const Object * src) : mm_{mm}, src_{src} {}
 
+        gc::IAlloc * mm_ = nullptr;
         const void * src_ = nullptr;
     };
 } /*namespace xo*/