[promisehook] Add is_promisehook_enabled

src/code-stub-assembler.cc

 // Copyright 2016 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/code-stub-assembler.h"
 #include "src/code-factory.h"
 #include "src/frames-inl.h"
 #include "src/frames.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 8219 matching lines @@
   return Word32Equal(holey_elements, Int32Constant(1));
 }
 
 Node* CodeStubAssembler::IsDebugActive() {
   Node* is_debug_active = Load(
       MachineType::Uint8(),
       ExternalConstant(ExternalReference::debug_is_active_address(isolate())));
   return WordNotEqual(is_debug_active, Int32Constant(0));
 }
 
+Node* CodeStubAssembler::IsPromiseHookEnabled() {
+  Node* const is_promisehook_enabled =
+      Load(MachineType::Uint8(),
+           ExternalConstant(
+               ExternalReference::is_promisehook_enabled_address(isolate())));
+  return WordNotEqual(is_promisehook_enabled, Int32Constant(0));
+}
+
 }  // namespace internal
 }  // namespace v8