Thread the current isolate through a few places, avoiding Isolate::Current().

src/jsregexp.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1448 matching lines @@
                                    bool multiline,
                                    Handle<String> pattern,
                                    bool is_ascii);
 
   static void DotPrint(const char* label, RegExpNode* node, bool ignore_case);
 };
 
 
 class OffsetsVector {
  public:
-  explicit inline OffsetsVector(int num_registers)
+  inline OffsetsVector(int num_registers, Isolate* isolate)
       : offsets_vector_length_(num_registers) {
     if (offsets_vector_length_ > Isolate::kJSRegexpStaticOffsetsVectorSize) {
       vector_ = NewArray<int>(offsets_vector_length_);
     } else {
-      vector_ = Isolate::Current()->jsregexp_static_offsets_vector();
+      vector_ = isolate->jsregexp_static_offsets_vector();
     }
   }
   inline ~OffsetsVector() {
     if (offsets_vector_length_ > Isolate::kJSRegexpStaticOffsetsVectorSize) {
       DeleteArray(vector_);
       vector_ = NULL;
     }
   }
   inline int* vector() { return vector_; }
   inline int length() { return offsets_vector_length_; }
 
   static const int kStaticOffsetsVectorSize = 50;
 
  private:
   static Address static_offsets_vector_address(Isolate* isolate) {
     return reinterpret_cast<Address>(isolate->jsregexp_static_offsets_vector());
   }
 
   int* vector_;
   int offsets_vector_length_;
 
   friend class ExternalReference;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_JSREGEXP_H_