Remove flush_monomorphic_ics flag.

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 0571b321f0c6aa87907ca9bcb47500d404477f7e..abdccc2ebd20de4582032f091b9bfc88dc5f4651 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -262,10 +262,8 @@ void StaticMarkingVisitor<StaticVisitor>::VisitCodeTarget(Heap* heap,
   // 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->is_call_stub() &&
-      ((heap->flush_monomorphic_ics() && !target->embeds_maps_weakly()) ||
-       heap->isolate()->serializer_enabled() ||
-       target->ic_age() != heap->global_ic_age())) {
+      !target->is_call_stub() && (heap->isolate()->serializer_enabled() ||
+                                  target->ic_age() != heap->global_ic_age())) {
     ICUtility::Clear(heap->isolate(), rinfo->pc(),
                      rinfo->host()->constant_pool());
     target = Code::GetCodeFromTargetAddress(rinfo->target_address());