src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp

rev 53257 : Cherry-pick: 8213199: GC abstraction for Assembler::needs_explicit_null_check() plus Shenandoah parts

*** 2787,2795 ****
--- 2787,2799 ----
  
  size_t ShenandoahHeap::obj_size(oop obj) const {
    return CollectedHeap::obj_size(obj) + ShenandoahBrooksPointer::word_size();
  }
  
+ ptrdiff_t ShenandoahHeap::cell_header_size() const {
+   return ShenandoahBrooksPointer::byte_size();
+ }
+ 
  BoolObjectClosure* ShenandoahIsAliveSelector::is_alive_closure() {
    return ShenandoahHeap::heap()->has_forwarded_objects() ? reinterpret_cast<BoolObjectClosure*>(&_fwd_alive_cl)
                                                           : reinterpret_cast<BoolObjectClosure*>(&_alive_cl);
  }