Reverting 3174. Aka reapplying 3150, 3151 and 3159. Aka api accessor

src/codegen.cc

Index: src/codegen.cc
diff --git a/src/codegen.cc b/src/codegen.cc
index 57d5f51898fc9a5a156df37b523486719861c2fc..732615f746ddac50326988e5d2a37af838211be6 100644
--- a/src/codegen.cc
+++ b/src/codegen.cc
@@ -552,4 +552,20 @@ void ArgumentsAccessStub::Generate(MacroAssembler* masm) {
 }
 
 
+bool ApiGetterEntryStub::GetCustomCache(Code** code_out) {
+  Object* cache = info()->load_stub_cache();
+  if (cache->IsUndefined()) {
+    return false;
+  } else {
+    *code_out = Code::cast(cache);
+    return true;
+  }
+}
+
+
+void ApiGetterEntryStub::SetCustomCache(Code* value) {
+  info()->set_load_stub_cache(value);
+}
+
+
 } }  // namespace v8::internal