Remove unnecessary Isolate::Current calls from hydrogen-instructions

src/hydrogen-instructions.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_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 6825 matching lines @@
   HObjectAccess access() const { return access_; }
   HValue* dominator() const { return dominator_; }
   bool has_transition() const { return HasTransitionField::decode(bit_field_); }
   StoreFieldOrKeyedMode store_mode() const {
     return StoreModeField::decode(bit_field_);
   }
 
   Handle<Map> transition_map() const {
     if (has_transition()) {
       return Handle<Map>::cast(
-          HConstant::cast(transition())->handle(Isolate::Current()));
+          HConstant::cast(transition())->handle(isolate()));
     } else {
       return Handle<Map>();
     }
   }
 
   void SetTransition(HConstant* transition) {
     DCHECK(!has_transition());  // Only set once.
     SetOperandAt(2, transition);
     bit_field_ = HasTransitionField::update(bit_field_, true);
     SetChangesFlag(kMaps);
@@ skipping 1088 matching lines @@
 };
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_