Fix FullGCForwarding initialization

src/hotspot/share/gc/g1/g1CollectedHeap.cpp

@@ -1435,7 +1435,7 @@ jint G1CollectedHeap::initialize() {
 
   G1InitLogger::print();
 
-  FullGCForwarding::initialize();
+  FullGCForwarding::initialize(heap_rs.region());
 
   return JNI_OK;
 }

src/hotspot/share/gc/parallel/parallelScavengeHeap.cpp

@@ -130,7 +130,7 @@ jint ParallelScavengeHeap::initialize() {
 
   ParallelInitLogger::print();
 
-  FullGCForwarding::initialize();
+  FullGCForwarding::initialize(heap_rs.region());
 
   return JNI_OK;
 }

src/hotspot/share/gc/serial/serialHeap.cpp

@@ -201,7 +201,7 @@ jint SerialHeap::initialize() {
 
   GCInitLogger::print();
 
-  FullGCForwarding::initialize();
+  FullGCForwarding::initialize(_reserved);
 
   return JNI_OK;
 }

src/hotspot/share/gc/shared/fullGCForwarding.cpp

@@ -45,8 +45,9 @@ void FullGCForwarding::initialize_flags(size_t max_heap_size) {
 #endif
 }
 
-void FullGCForwarding::initialize() {
+void FullGCForwarding::initialize(MemRegion heap) {
 #ifdef _LP64
+  _heap_base = heap.start();
   if (UseCompactObjectHeaders) {
     _num_low_bits = NumLowBitsNarrow;
   } else {

src/hotspot/share/gc/shared/fullGCForwarding.hpp

@@ -50,7 +50,7 @@ class FullGCForwarding : public AllStatic {
   static int _num_low_bits;
 public:
   static void initialize_flags(size_t max_heap_size);
-  static void initialize();
+  static void initialize(MemRegion heap);
   static inline void forward_to(oop from, oop to);
   static inline oop forwardee(oop from);
   static inline bool is_forwarded(oop obj);

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

@@ -423,7 +423,7 @@ jint ShenandoahHeap::initialize() {
 
   ShenandoahInitLogger::print();
 
-  FullGCForwarding::initialize();
+  FullGCForwarding::initialize(_heap_region);
 
   return JNI_OK;
 }

test/hotspot/gtest/gc/shared/test_preservedMarks.cpp

@@ -37,7 +37,7 @@ TEST_VM(PreservedMarks, iterate_and_restore) {
 
   HeapWord fakeheap[32] = { nullptr };
   HeapWord* heap = align_up(fakeheap, 8 * sizeof(HeapWord));
-  FullGCForwarding::initialize();
+  FullGCForwarding::initialize(MemRegion(&heap[0], &heap[16]));
 
   oop o1 = cast_to_oop(&heap[0]); o1->set_mark(originalMark());
   oop o2 = cast_to_oop(&heap[2]); o2->set_mark(originalMark());