[heap] Add basic infrastructure for Minor Mark-Compact collector

src/global-handles.cc

Index: src/global-handles.cc
diff --git a/src/global-handles.cc b/src/global-handles.cc
index 553aff56d7a01360e37fd9f5408cd310d9f1ae1f..9ff16affe4f948114ee18d1558dfe259da6dc079 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -1062,7 +1062,7 @@ int GlobalHandles::PostGarbageCollectionProcessing(
     // PostScavengeProcessing.
     return freed_nodes;
   }
-  if (collector == SCAVENGER) {
+  if (Heap::IsYoungGenerationCollector(collector)) {
     freed_nodes += PostScavengeProcessing(initial_post_gc_processing_count);
   } else {
     freed_nodes += PostMarkSweepProcessing(initial_post_gc_processing_count);