Pass Isolate to CodeAgingHelper

src/codegen.h

 // Copyright 2012 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.
 
 #ifndef V8_CODEGEN_H_
 #define V8_CODEGEN_H_
 
 #include "src/code-stubs.h"
 #include "src/runtime/runtime.h"
 
@@ skipping 128 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ElementsTransitionGenerator);
 };
 
 static const int kNumberDictionaryProbes = 4;
 
 
 class CodeAgingHelper {
  public:
-  CodeAgingHelper();
+  explicit CodeAgingHelper(Isolate* isolate);
 
   uint32_t young_sequence_length() const { return young_sequence_.length(); }
   bool IsYoung(byte* candidate) const {
     return memcmp(candidate,
                   young_sequence_.start(),
                   young_sequence_.length()) == 0;
   }
   void CopyYoungSequenceTo(byte* new_buffer) const {
     CopyBytes(new_buffer, young_sequence_.start(), young_sequence_.length());
   }
 
 #ifdef DEBUG
   bool IsOld(byte* candidate) const;
 #endif
 
  protected:
   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> young_sequence_;
 #ifdef DEBUG
 #ifdef V8_TARGET_ARCH_ARM64
   const EmbeddedVector<byte, kNoCodeAgeSequenceLength> old_sequence_;
 #endif
 #endif
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CODEGEN_H_