Reland of [stubs] Port KeyedLoadIC_Generic stub to TurboFan

src/ic/handler-compiler.cc

Index: src/ic/handler-compiler.cc
diff --git a/src/ic/handler-compiler.cc b/src/ic/handler-compiler.cc
index b6b81def540278a1a2fa89c337d6f2dc1c1c1396..e79a771c5dc303f4f11122ccee59a285fde1fb5f 100644
--- a/src/ic/handler-compiler.cc
+++ b/src/ic/handler-compiler.cc
@@ -601,13 +601,21 @@ Handle<Object> ElementHandlerCompiler::GetKeyedLoadHandler(
     TRACE_HANDLER_STATS(isolate, KeyedLoadIC_KeyedLoadSloppyArgumentsStub);
     return KeyedLoadSloppyArgumentsStub(isolate).GetCode();
   }
+  bool is_js_array = instance_type == JS_ARRAY_TYPE;
   if (elements_kind == DICTIONARY_ELEMENTS) {
+    if (FLAG_tf_load_ic_stub) {
+      int config = KeyedLoadElementsKind::encode(elements_kind) |
+                   KeyedLoadConvertHole::encode(false) |
+                   KeyedLoadIsJsArray::encode(is_js_array) |
+                   LoadHandlerTypeBit::encode(kLoadICHandlerForElements);
+      return handle(Smi::FromInt(config), isolate);
+    }
     TRACE_HANDLER_STATS(isolate, KeyedLoadIC_LoadDictionaryElementStub);
     return LoadDictionaryElementStub(isolate).GetCode();
   }
   DCHECK(IsFastElementsKind(elements_kind) ||
          IsFixedTypedArrayElementsKind(elements_kind));
-  bool is_js_array = instance_type == JS_ARRAY_TYPE;
+  // TODO(jkummerow): Use IsHoleyElementsKind(elements_kind).
   bool convert_hole_to_undefined =
       is_js_array && elements_kind == FAST_HOLEY_ELEMENTS &&
       *receiver_map == isolate->get_initial_js_array_map(elements_kind);