Add some missing variables/functions in mmtk.h

Author: qinsoon

mmtk/api/mmtk.h

@@ -85,7 +85,7 @@ extern void mmtk_block_thread_for_gc(void);
 extern void* mmtk_new_mutator_iterator(void);
 extern void* mmtk_get_next_mutator_tls(void*);
 extern void* mmtk_close_mutator_iterator(void*);
-
+extern void mmtk_store_obj_size_c(void* obj, size_t size);
 
 /**
  * VM Accounting
@@ -106,6 +106,11 @@ extern void mmtk_add_phantom_candidate(void* ref);
 extern void mmtk_harness_begin(void *tls);
 extern void mmtk_harness_end(void);
 
+/**
+ * Copying
+ */
+extern const void* MMTK_SIDE_VO_BIT_BASE_ADDRESS;
+
 #ifdef __cplusplus
 }
 #endif