Refactor ExternalReference::isolate_address() to not rely on Isolate::Current().

src/deoptimizer.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 291 matching lines @@
    public:
     EntryGenerator(MacroAssembler* masm, BailoutType type)
         : masm_(masm), type_(type) { }
     virtual ~EntryGenerator() { }
 
     void Generate();
 
    protected:
     MacroAssembler* masm() const { return masm_; }
     BailoutType type() const { return type_; }
+    Isolate* isolate() const { return masm_->isolate(); }
 
     virtual void GeneratePrologue() { }
 
    private:
     MacroAssembler* masm_;
     Deoptimizer::BailoutType type_;
   };
 
   class TableEntryGenerator : public EntryGenerator {
    public:
@@ skipping 594 matching lines @@
   Object** expression_stack_;
   int source_position_;
 
   friend class Deoptimizer;
 };
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEOPTIMIZER_H_