Introduce accessors on builtins instance

src/x64/deoptimizer-x64.cc

Index: src/x64/deoptimizer-x64.cc
diff --git a/src/x64/deoptimizer-x64.cc b/src/x64/deoptimizer-x64.cc
index 63067bd8e6c78251b85b665b22a987c3865b0d3e..fca4e4442befb841763f90d7e7d8759fd4a8e94d 100644
--- a/src/x64/deoptimizer-x64.cc
+++ b/src/x64/deoptimizer-x64.cc
@@ -187,7 +187,7 @@ void Deoptimizer::DeoptimizeFunction(JSFunction* function) {
 
   // Add the deoptimizing code to the list.
   DeoptimizingCodeListNode* node = new DeoptimizingCodeListNode(code);
-  DeoptimizerData* data = Isolate::Current()->deoptimizer_data();
+  DeoptimizerData* data = code->GetIsolate()->deoptimizer_data();
   node->set_next(data->deoptimizing_code_list_);
   data->deoptimizing_code_list_ = node;
 
@@ -389,8 +389,8 @@ void Deoptimizer::DoComputeOsrOutputFrame() {
         optimized_code_->entry() + pc_offset);
     output_[0]->SetPc(pc);
   }
-  Code* continuation = Isolate::Current()->builtins()->builtin(
-      Builtins::NotifyOSR);
+  Code* continuation =
+      function->GetIsolate()->builtins()->builtin(Builtins::kNotifyOSR);
   output_[0]->SetContinuation(
       reinterpret_cast<intptr_t>(continuation->entry()));
 
@@ -562,9 +562,8 @@ void Deoptimizer::DoComputeFrame(TranslationIterator* iterator,
   // Set the continuation for the topmost frame.
   if (is_topmost) {
     Code* continuation = (bailout_type_ == EAGER)
-        ? Isolate::Current()->builtins()->builtin(Builtins::NotifyDeoptimized)
-        : Isolate::Current()->builtins()->builtin(
-              Builtins::NotifyLazyDeoptimized);
+        ? isolate_->builtins()->builtin(Builtins::kNotifyDeoptimized)
+        : isolate_->builtins()->builtin(Builtins::kNotifyLazyDeoptimized);
     output_frame->SetContinuation(
         reinterpret_cast<intptr_t>(continuation->entry()));
   }