Age inline caches after context disposal.

src/incremental-marking.cc

Index: src/incremental-marking.cc
diff --git a/src/incremental-marking.cc b/src/incremental-marking.cc
index c4f166bb9877f0fad7a27843e2f5d95636d75033..8fe89b4a98c4500ed5527fd602ab55793e21896a 100644
--- a/src/incremental-marking.cc
+++ b/src/incremental-marking.cc
@@ -178,7 +178,12 @@ class IncrementalMarkingMarkingVisitor : public ObjectVisitor {
 
   void VisitCodeTarget(RelocInfo* rinfo) {
     ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode()));
-    Object* target = Code::GetCodeFromTargetAddress(rinfo->target_address());
+    Code* target = Code::GetCodeFromTargetAddress(rinfo->target_address());
+    if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub()
+        && (target->ic_age() != heap_->global_ic_age())) {
+      IC::Clear(rinfo->pc());
+      target = Code::GetCodeFromTargetAddress(rinfo->target_address());
+    }
     heap_->mark_compact_collector()->RecordRelocSlot(rinfo, Code::cast(target));
     MarkObject(target);
   }
@@ -795,6 +800,12 @@ void IncrementalMarking::Step(intptr_t allocated_bytes) {
       Map* map = obj->map();
       if (map == filler_map) continue;
 
+      if (obj->IsMap()) {
+        Map* map = Map::cast(obj);
+        heap_->ClearCacheOnMap(map);
+      }
+
+
       int size = obj->SizeFromMap(map);
       bytes_to_process -= size;
       MarkBit map_mark_bit = Marking::MarkBitFrom(map);