AdjustLiveBytes and friends takes a heap object pointer instead of an address.

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 3df88e300c3ad8f53028e452dc8f0a5a24976b73..f51d22560b5f0c88c9b95b832da4ac83ed7891d8 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -885,8 +885,7 @@ bool String::MakeExternal(v8::String::ExternalStringResource* resource) {
   self->set_resource(resource);
   if (is_internalized) self->Hash();  // Force regeneration of the hash value.
 
-  heap->AdjustLiveBytes(this->address(), new_size - size,
-                        Heap::CONCURRENT_TO_SWEEPER);
+  heap->AdjustLiveBytes(this, new_size - size, Heap::CONCURRENT_TO_SWEEPER);
   return true;
 }
 
@@ -946,8 +945,7 @@ bool String::MakeExternal(v8::String::ExternalOneByteStringResource* resource) {
   self->set_resource(resource);
   if (is_internalized) self->Hash();  // Force regeneration of the hash value.
 
-  heap->AdjustLiveBytes(this->address(), new_size - size,
-                        Heap::CONCURRENT_TO_SWEEPER);
+  heap->AdjustLiveBytes(this, new_size - size, Heap::CONCURRENT_TO_SWEEPER);
   return true;
 }
 
@@ -2045,7 +2043,7 @@ void JSObject::MigrateFastToFast(Handle<JSObject> object, Handle<Map> new_map) {
     Address address = object->address();
     heap->CreateFillerObjectAt(
         address + new_instance_size, instance_size_delta);
-    heap->AdjustLiveBytes(address, -instance_size_delta,
+    heap->AdjustLiveBytes(*object, -instance_size_delta,
                           Heap::CONCURRENT_TO_SWEEPER);
   }
 
@@ -4577,7 +4575,7 @@ void JSObject::MigrateFastToSlow(Handle<JSObject> object,
     Heap* heap = isolate->heap();
     heap->CreateFillerObjectAt(object->address() + new_instance_size,
                                instance_size_delta);
-    heap->AdjustLiveBytes(object->address(), -instance_size_delta,
+    heap->AdjustLiveBytes(*object, -instance_size_delta,
                           Heap::CONCURRENT_TO_SWEEPER);
   }
 
@@ -9124,7 +9122,7 @@ Handle<String> SeqString::Truncate(Handle<SeqString> string, int new_length) {
     // that are a multiple of pointer size.
     heap->CreateFillerObjectAt(start_of_string + new_size, delta);
   }
-  heap->AdjustLiveBytes(start_of_string, -delta, Heap::CONCURRENT_TO_SWEEPER);
+  heap->AdjustLiveBytes(*string, -delta, Heap::CONCURRENT_TO_SWEEPER);
 
   // We are storing the new length using release store after creating a filler
   // for the left-over space to avoid races with the sweeper thread.