[turbofan] Use FastNewClosureStub if possible.

src/compiler/ast-graph-builder.cc

 // Copyright 2014 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.
 
 #include "src/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/js-type-feedback.h"
@@ skipping 1455 matching lines @@
   // Build a new shared function info if we cannot find one in the baseline
   // code. We also have a stack overflow if the recursive compilation did.
   expr->InitializeSharedInfo(handle(info()->shared_info()->code()));
   Handle<SharedFunctionInfo> shared_info = expr->shared_info();
   if (shared_info.is_null()) {
     shared_info = Compiler::BuildFunctionInfo(expr, info()->script(), info());
     CHECK(!shared_info.is_null());  // TODO(mstarzinger): Set stack overflow?
   }
 
   // Create node to instantiate a new closure.
-  Node* info = jsgraph()->Constant(shared_info);
-  Node* pretenure = jsgraph()->BooleanConstant(expr->pretenure());
-  const Operator* op = javascript()->CallRuntime(Runtime::kNewClosure, 3);
-  Node* value = NewNode(op, context, info, pretenure);
+  PretenureFlag pretenure = expr->pretenure() ? TENURED : NOT_TENURED;
+  const Operator* op = javascript()->CreateClosure(shared_info, pretenure);
+  Node* value = NewNode(op, context);
   ast_context()->ProduceValue(value);
 }
 
 
 void AstGraphBuilder::VisitClassLiteral(ClassLiteral* expr) {
   if (expr->scope() == NULL) {
     // Visit class literal in the same scope, no declarations.
     VisitClassLiteralContents(expr);
   } else {
     // Visit declarations and class literal in a block scope.
@@ skipping 2089 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8