Disable compaction.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index fdc7edc59745c7ce3c99b4c74f790c76d3ac5837..07e490ed022d92b7c831cb46d8424dab53d98550 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -245,7 +245,10 @@ bool MarkCompactCollector::StartCompaction() {
 
     CollectEvacuationCandidates(heap()->old_pointer_space());
     CollectEvacuationCandidates(heap()->old_data_space());
-    CollectEvacuationCandidates(heap()->code_space());
+
+    if (FLAG_compact_code_space) {
+      CollectEvacuationCandidates(heap()->code_space());
+    }
 
     heap()->old_pointer_space()->EvictEvacuationCandidatesFromFreeLists();
     heap()->old_data_space()->EvictEvacuationCandidatesFromFreeLists();