[heap] Incorporate code_lo_space_ in OldGenerationSizeOfObjects()

Bug: v8:10315
Change-Id: Ic0ccaa608c9b11258e6923919d3e72d23cedc5c2
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2333249Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69192}

src/heap/heap.cc

@@ -4891,7 +4891,7 @@ size_t Heap::OldGenerationSizeOfObjects() {
        space = spaces.Next()) {
     total += space->SizeOfObjects();
   }
-  return total + lo_space_->SizeOfObjects();
+  return total + lo_space_->SizeOfObjects() + code_lo_space_->SizeOfObjects();
 }
 
 size_t Heap::GlobalSizeOfObjects() {