Remove CC refinement table handling

The upstream changed the CC refinement table into an ordinary RTypedData
with weak reference field handling.  We no longer need to do anything
special to that because the existing weak field handling mechanism is
sufficient.

Author: wks

internal/mmtk.h

@@ -106,8 +106,6 @@ typedef struct MMTk_RubyUpcalls {
     void (*update_generic_fields_table)(void);
     size_t (*get_frozen_strings_table_size)(void);
     void (*update_frozen_strings_table)(void);
-    size_t (*get_cc_refinement_table_size)(void);
-    void (*update_cc_refinement_table)(void);
     MMTk_NullableObjectReference (*get_fstring_table_obj)(void);
     MMTk_NullableObjectReference (*get_global_symbols_table_obj)(void);
     size_t (*st_get_num_entries)(const struct st_table *table);

mmtk_support.c

@@ -1328,23 +1328,6 @@ rb_mmtk_update_frozen_strings_table(void)
     rb_gc_vm_weak_table_foreach(rb_mmtk_update_table_i, rb_mmtk_update_table_replace_i, NULL, true, RB_GC_VM_FROZEN_STRINGS_TABLE);
 }
 
-//////// CC refinement table
-
-size_t
-rb_mmtk_get_cc_refinement_table_size(void)
-{
-    return GET_VM()->cc_refinement_table->num_entries;
-}
-
-void
-rb_mmtk_update_cc_refinement_table(void)
-{
-    // We just use the default implementation to clean it up.
-
-    rb_gc_vm_weak_table_foreach(rb_mmtk_update_table_i, rb_mmtk_update_table_replace_i, NULL, true, RB_GC_VM_CC_REFINEMENT_TABLE);
-}
-
-
 /////////////// END: Concrete global weak tables ////////////////
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -2038,8 +2021,6 @@ MMTk_RubyUpcalls ruby_upcalls = {
     rb_mmtk_update_generic_fields_table,
     rb_mmtk_get_frozen_strings_table_size,
     rb_mmtk_update_frozen_strings_table,
-    rb_mmtk_get_cc_refinement_table_size,
-    rb_mmtk_update_cc_refinement_table,
     // Get tables for specialized processing
     rb_mmtk_get_fstring_table_obj_wrapper,
     rb_mmtk_get_global_symbols_table_obj,