8255196: Remove unused G1FullGCCompactionPoint::merge()

Reviewed-by: shade

src/hotspot/share/gc/g1/g1FullGCCompactionPoint.cpp

@@ -136,10 +136,6 @@ void G1FullGCCompactionPoint::add(HeapRegion* hr) {
   _compaction_regions->append(hr);
 }
 
-void G1FullGCCompactionPoint::merge(G1FullGCCompactionPoint* other) {
-   _compaction_regions->appendAll(other->regions());
-}
-
 HeapRegion* G1FullGCCompactionPoint::remove_last() {
   return _compaction_regions->pop();
 }

src/hotspot/share/gc/g1/g1FullGCCompactionPoint.hpp

@@ -53,7 +53,6 @@ public:
   void update();
   void forward(oop object, size_t size);
   void add(HeapRegion* hr);
-  void merge(G1FullGCCompactionPoint* other);
 
   HeapRegion* remove_last();
   HeapRegion* current_region();