[stubs,interpreter] Optimise SMI loading for 64-bit targets.

src/interpreter/interpreter-assembler.h

 // Copyright 2015 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_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 #define V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_
 
 #include "src/allocation.h"
 #include "src/builtins/builtins.h"
 #include "src/code-stub-assembler.h"
@@ skipping 59 matching lines @@
   // Returns the next consecutive register.
   compiler::Node* NextRegister(compiler::Node* reg_index);
 
   // Returns the location in memory of the register |reg_index| in the
   // interpreter register file.
   compiler::Node* RegisterLocation(compiler::Node* reg_index);
 
   // Load constant at |index| in the constant pool.
   compiler::Node* LoadConstantPoolEntry(compiler::Node* index);
 
+  // Load and untag constant at |index| in the constant pool.
+  compiler::Node* LoadAndUntagConstantPoolEntry(compiler::Node* index);
+
   // Load |slot_index| from |context|.
   compiler::Node* LoadContextSlot(compiler::Node* context, int slot_index);
   compiler::Node* LoadContextSlot(compiler::Node* context,
                                   compiler::Node* slot_index);
   // Stores |value| into |slot_index| of |context|.
   compiler::Node* StoreContextSlot(compiler::Node* context,
                                    compiler::Node* slot_index,
                                    compiler::Node* value);
 
   // Load the TypeFeedbackVector for the current function.
@@ skipping 190 matching lines @@
   compiler::Node* stack_pointer_before_call_;
 
   DISALLOW_COPY_AND_ASSIGN(InterpreterAssembler);
 };
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_INTERPRETER_INTERPRETER_ASSEMBLER_H_