[turbofan] Remove usage of Unique<T> from graph.

src/compiler/ast-graph-builder.h

 // 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.
 
 #ifndef V8_COMPILER_AST_GRAPH_BUILDER_H_
 #define V8_COMPILER_AST_GRAPH_BUILDER_H_
 
 #include "src/ast.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/liveness-analyzer.h"
@@ skipping 212 matching lines @@
   BitVector* GetVariablesAssignedInLoop(IterationStatement* stmt);
 
   // Check if the given statement is an OSR entry.
   // If so, record the stack height into the compilation and return {true}.
   bool CheckOsrEntry(IterationStatement* stmt);
 
   // Computes local variable liveness and replaces dead variables in
   // frame states with the undefined values.
   void ClearNonLiveSlotsInFrameStates();
 
-  // Helper to wrap a Handle<T> into a Unique<T>.
-  template <class T>
-  Unique<T> MakeUnique(Handle<T> object) {
-    return Unique<T>::CreateUninitialized(object);
-  }
-
   Node** EnsureInputBufferSize(int size);
 
   // Named and keyed loads require a VectorSlotPair for successful lowering.
   VectorSlotPair CreateVectorSlotPair(FeedbackVectorICSlot slot) const;
 
   // Determine which contexts need to be checked for extension objects that
   // might shadow the optimistic declaration of dynamic lookup variables.
   uint32_t ComputeBitsetForDynamicGlobal(Variable* variable);
   uint32_t ComputeBitsetForDynamicContext(Variable* variable);
 
@@ skipping 311 matching lines @@
 
   // Prepare environment to be used as loop header.
   void PrepareForLoop(BitVector* assigned, bool is_osr = false);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_