Robustify the clearing of the cache of map-related ICs on the map.

src/mark-compact-inl.h

Index: src/mark-compact-inl.h
===================================================================
--- src/mark-compact-inl.h	(revision 10437)
+++ src/mark-compact-inl.h	(working copy)
@@ -49,6 +49,13 @@
 }
 
 
+void MarkCompactCollector::ClearCacheOnMap(Map* map) {
+  if (FLAG_cleanup_code_caches_at_gc) {
+    map->ClearCodeCache(heap());
+  }
+}
+
+
 void MarkCompactCollector::MarkObject(HeapObject* obj, MarkBit mark_bit) {
   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
   if (!mark_bit.Get()) {
@@ -64,6 +71,9 @@
   ASSERT(Marking::MarkBitFrom(obj) == mark_bit);
   mark_bit.Set();
   MemoryChunk::IncrementLiveBytesFromGC(obj->address(), obj->Size());
+  if (obj->IsMap()) {
+    ClearCacheOnMap(Map::cast(obj));
+  }
 }