Reland r12342: Flush monomorphic ICs on context disposal instead of context exit.

src/objects-visiting-inl.h

Index: src/objects-visiting-inl.h
diff --git a/src/objects-visiting-inl.h b/src/objects-visiting-inl.h
index 3d4f1daba40f9eea5df0695b4f4bdcf1fc8c0d6d..6655be680e883c5d7eb8404be32f39c13bb7d5e2 100644
--- a/src/objects-visiting-inl.h
+++ b/src/objects-visiting-inl.h
@@ -214,9 +214,8 @@ void StaticMarkingVisitor<StaticVisitor>::VisitCodeTarget(
   // when they might be keeping a Context alive, or when the heap is about
   // to be serialized.
   if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub()
-      && (target->ic_state() == MEGAMORPHIC || Serializer::enabled() ||
-          heap->isolate()->context_exit_happened() ||
-          target->ic_age() != heap->global_ic_age())) {
+      && (target->ic_state() == MEGAMORPHIC || heap->flush_monomorphic_ics() ||
+          Serializer::enabled() || target->ic_age() != heap->global_ic_age())) {
     IC::Clear(rinfo->pc());
     target = Code::GetCodeFromTargetAddress(rinfo->target_address());
   }