Don't MISS if you read the hole from certain FastHoley arrays.

src/code-stubs.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 2209 matching lines @@
  private:
   Code::Kind kind() const override { return Code::STORE_IC; }
 
   DEFINE_HANDLER_CODE_STUB(StoreScriptContextField, ScriptContextFieldStub);
 };
 
 
 class LoadFastElementStub : public HydrogenCodeStub {
  public:
   LoadFastElementStub(Isolate* isolate, bool is_js_array,
-                      ElementsKind elements_kind)
+                      ElementsKind elements_kind,
+                      bool convert_hole_to_undefined = false)
       : HydrogenCodeStub(isolate) {
-    set_sub_minor_key(ElementsKindBits::encode(elements_kind) |
-                      IsJSArrayBits::encode(is_js_array));
+    set_sub_minor_key(
+        ElementsKindBits::encode(elements_kind) |
+        IsJSArrayBits::encode(is_js_array) |
+        CanConvertHoleToUndefined::encode(convert_hole_to_undefined));
   }
 
   bool is_js_array() const { return IsJSArrayBits::decode(sub_minor_key()); }
+  bool convert_hole_to_undefined() const {
+    return CanConvertHoleToUndefined::decode(sub_minor_key());
+  }
 
   ElementsKind elements_kind() const {
     return ElementsKindBits::decode(sub_minor_key());
   }
 
  private:
   class ElementsKindBits: public BitField<ElementsKind, 0, 8> {};
   class IsJSArrayBits: public BitField<bool, 8, 1> {};
+  class CanConvertHoleToUndefined : public BitField<bool, 9, 1> {};
 
   CallInterfaceDescriptor GetCallInterfaceDescriptor() override {
     if (FLAG_vector_ics) {
       return VectorLoadICDescriptor(isolate());
     }
     return LoadDescriptor(isolate());
   }
 
   DEFINE_HYDROGEN_CODE_STUB(LoadFastElement, HydrogenCodeStub);
 };
@@ skipping 499 matching lines @@
 
 #undef DEFINE_CALL_INTERFACE_DESCRIPTOR
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_