Revert of Refactor SharedFunctionInfo::IsBuiltin.

src/compiler/pipeline.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/compiler/pipeline.h"
 
 #include <fstream>  // NOLINT(readability/streams)
 #include <memory>
 #include <sstream>
 
@@ skipping 1489 matching lines @@
   if (FLAG_print_turbo_replay) {
     // Print a replay of the initial graph.
     GraphReplayPrinter::PrintReplay(data->graph());
   }
 
   // Run the type-sensitive lowerings and optimizations on the graph.
   {
     // Determine the Typer operation flags.
     Typer::Flags flags = Typer::kNoFlags;
     if (is_sloppy(info()->shared_info()->language_mode()) &&
-        info()->shared_info()->IsUserJavaScript()) {
+        !info()->shared_info()->IsBuiltin()) {
       // Sloppy mode functions always have an Object for this.
       flags |= Typer::kThisIsReceiver;
     }
     if (IsClassConstructor(info()->shared_info()->kind())) {
       // Class constructors cannot be [[Call]]ed.
       flags |= Typer::kNewTargetIsReceiver;
     }
 
     // Type the graph and keep the Typer running on newly created nodes within
     // this scope; the Typer is automatically unlinked from the Graph once we
@@ skipping 443 matching lines @@
   data->DeleteRegisterAllocationZone();
 }
 
 CompilationInfo* PipelineImpl::info() const { return data_->info(); }
 
 Isolate* PipelineImpl::isolate() const { return info()->isolate(); }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8