[heap] Make link from optimized code to inlined code explicit.

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 0e025b22f2af61dabef81bca9136b518c162fc2d..3d914b863f64147d06d10d99cb587639a01019a9 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -415,13 +415,6 @@ void StaticMarkingVisitor<StaticVisitor>::VisitCode(Map* map,
   if (FLAG_age_code && !heap->isolate()->serializer_enabled()) {
     code->MakeOlder(heap->mark_compact_collector()->marking_parity());
   }
-  MarkCompactCollector* collector = heap->mark_compact_collector();
-  if (collector->is_code_flushing_enabled()) {
-    if (code->kind() == Code::OPTIMIZED_FUNCTION) {
-      // Visit all unoptimized code objects to prevent flushing them.
-      MarkInlinedFunctionsCode(heap, code);
-    }
-  }
   CodeBodyVisitor::Visit(map, object);
 }
 
@@ -605,25 +598,6 @@ void StaticMarkingVisitor<StaticVisitor>::MarkOptimizedCodeMap(
 }
 
 
-template <typename StaticVisitor>
-void StaticMarkingVisitor<StaticVisitor>::MarkInlinedFunctionsCode(Heap* heap,
-                                                                   Code* code) {
-  // For optimized functions we should retain both non-optimized version
-  // of its code and non-optimized version of all inlined functions.
-  // This is required to support bailing out from inlined code.
-  if (code->deoptimization_data() != heap->empty_fixed_array()) {
-    DeoptimizationInputData* const data =
-        DeoptimizationInputData::cast(code->deoptimization_data());
-    FixedArray* const literals = data->LiteralArray();
-    int const inlined_count = data->InlinedFunctionCount()->value();
-    for (int i = 0; i < inlined_count; ++i) {
-      StaticVisitor::MarkObject(
-          heap, SharedFunctionInfo::cast(literals->get(i))->code());
-    }
-  }
-}
-
-
 inline static bool HasSourceCode(Heap* heap, SharedFunctionInfo* info) {
   Object* undefined = heap->undefined_value();
   return (info->script() != undefined) &&