remove most uses of Isolate::Current in arch specific files

src/assembler.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 407 matching lines @@
   // Read/modify the address of a call instruction. This is used to relocate
   // the break points where straight-line code is patched with a call
   // instruction.
   INLINE(Address call_address());
   INLINE(void set_call_address(Address target));
   INLINE(Object* call_object());
   INLINE(void set_call_object(Object* target));
   INLINE(Object** call_object_address());
 
   template<typename StaticVisitor> inline void Visit(Heap* heap);
-  inline void Visit(ObjectVisitor* v);
+  inline void Visit(Isolate* isolate, ObjectVisitor* v);
 
   // Patch the code with some other code.
   void PatchCode(byte* instructions, int instruction_count);
 
   // Patch the code with a call.
   void PatchCodeWithCall(Address target, int guard_bytes);
 
   // Check whether this return sequence has been patched
   // with a call to the debugger.
   INLINE(bool IsPatchedReturnSequence());
@@ skipping 618 matching lines @@
  public:
   NullCallWrapper() { }
   virtual ~NullCallWrapper() { }
   virtual void BeforeCall(int call_size) const { }
   virtual void AfterCall() const { }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ASSEMBLER_H_