[stubs] Port LoadIndexedStringStub to CSA

src/ic/handler-compiler.cc

 // Copyright 2014 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.
 
 #include "src/ic/handler-compiler.h"
 
 #include "src/field-type.h"
 #include "src/ic/call-optimization.h"
 #include "src/ic/handler-configuration-inl.h"
 #include "src/ic/ic-inl.h"
@@ skipping 334 matching lines @@
 Handle<Object> ElementHandlerCompiler::GetKeyedLoadHandler(
     Handle<Map> receiver_map, Isolate* isolate) {
   if (receiver_map->has_indexed_interceptor() &&
       !receiver_map->GetIndexedInterceptor()->getter()->IsUndefined(isolate) &&
       !receiver_map->GetIndexedInterceptor()->non_masking()) {
     TRACE_HANDLER_STATS(isolate, KeyedLoadIC_LoadIndexedInterceptorStub);
     return LoadIndexedInterceptorStub(isolate).GetCode();
   }
   if (receiver_map->IsStringMap()) {
     TRACE_HANDLER_STATS(isolate, KeyedLoadIC_LoadIndexedStringStub);
-    return LoadIndexedStringStub(isolate).GetCode();
+    return isolate->builtins()->KeyedLoadIC_IndexedString();
   }
   InstanceType instance_type = receiver_map->instance_type();
   if (instance_type < FIRST_JS_RECEIVER_TYPE) {
     TRACE_HANDLER_STATS(isolate, KeyedLoadIC_SlowStub);
     return isolate->builtins()->KeyedLoadIC_Slow();
   }
 
   ElementsKind elements_kind = receiver_map->elements_kind();
   if (IsSloppyArgumentsElements(elements_kind)) {
     TRACE_HANDLER_STATS(isolate, KeyedLoadIC_KeyedLoadSloppyArgumentsStub);
@@ skipping 16 matching lines @@
 }
 
 void ElementHandlerCompiler::CompileElementHandlers(
     MapHandleList* receiver_maps, List<Handle<Object>>* handlers) {
   for (int i = 0; i < receiver_maps->length(); ++i) {
     handlers->Add(GetKeyedLoadHandler(receiver_maps->at(i), isolate()));
   }
 }
 }  // namespace internal
 }  // namespace v8