[builtins] add CodeStubAssembler::IsDebugActive() helper

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 7691 matching lines @@
 
   STATIC_ASSERT(FAST_HOLEY_SMI_ELEMENTS == (FAST_SMI_ELEMENTS | 1));
   STATIC_ASSERT(FAST_HOLEY_ELEMENTS == (FAST_ELEMENTS | 1));
   STATIC_ASSERT(FAST_HOLEY_DOUBLE_ELEMENTS == (FAST_DOUBLE_ELEMENTS | 1));
 
   // Check prototype chain if receiver does not have packed elements.
   Node* holey_elements = Word32And(elements_kind, Int32Constant(1));
   return Word32Equal(holey_elements, Int32Constant(1));
 }
 
+compiler::Node* CodeStubAssembler::IsDebugActive() {
+  Node* is_debug_active = Load(
+      MachineType::Uint8(),
+      ExternalConstant(ExternalReference::debug_is_active_address(isolate())));
+  return WordNotEqual(is_debug_active, Int32Constant(0));
+}
+
 }  // namespace internal
 }  // namespace v8