[heap] Correctly report code LO space size with --trace-gc-verbose.

The --trace-gc-verbose flag was mistakenly reporting the generic LO space size
in place of the *code* LO space size.

Change-Id: Iddb83b540b0e0a201aa358649d91ef606721e0be
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1554693
Commit-Queue: Pierre Langlois <pierre.langlois@arm.com>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60665}

src/heap/heap.cc

@@ -428,7 +428,7 @@ void Heap::PrintShortHeapStatistics() {
                ", available: %6" PRIuS
                " KB"
                ", committed: %6" PRIuS " KB\n",
-               lo_space_->SizeOfObjects() / KB,
+               code_lo_space_->SizeOfObjects() / KB,
                code_lo_space_->Available() / KB,
                code_lo_space_->CommittedMemory() / KB);
   PrintIsolate(isolate_,