Fix crash when --ll_prof is enabled after cb29f9c

src/snapshot/deserializer.cc

Index: src/snapshot/deserializer.cc
diff --git a/src/snapshot/deserializer.cc b/src/snapshot/deserializer.cc
index d7b99858d8aea590d6ddcfbc8aec3e5e7eb71cd6..91b47c54d437ade556290980489295811c8d6fb0 100644
--- a/src/snapshot/deserializer.cc
+++ b/src/snapshot/deserializer.cc
@@ -364,14 +364,15 @@ void Deserializer::ReadObject(int space_number, Object** write_back) {
   isolate_->heap()->OnAllocationEvent(obj, size);
   Object** current = reinterpret_cast<Object**>(address);
   Object** limit = current + (size >> kPointerSizeLog2);
-  if (FLAG_log_snapshot_positions) {
-    LOG(isolate_, SnapshotPositionEvent(address, source_.position()));
-  }
+  int position = source_.position();
 
   if (ReadData(current, limit, space_number, address)) {
     // Only post process if object content has not been deferred.
     obj = PostProcessNewObject(obj, space_number);
   }
+  if (FLAG_log_snapshot_positions) {
+    LOG(isolate_, SnapshotPositionEvent(obj, position));
+  }
 
   Object* write_back_obj = obj;
   UnalignedCopy(write_back, &write_back_obj);