[turbofan] Hook up the shift code stubs with TurboFan.

src/compiler/x64/code-generator-x64.cc

 // Copyright 2013 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/code-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 2260 matching lines @@
 }
 
 
 void CodeGenerator::AssembleJumpTable(Label** targets, size_t target_count) {
   for (size_t index = 0; index < target_count; ++index) {
     __ dq(targets[index]);
   }
 }
 
 
-void CodeGenerator::AddNopForSmiCodeInlining() { __ nop(); }
-
-
 void CodeGenerator::EnsureSpaceForLazyDeopt() {
   if (!info()->ShouldEnsureSpaceForLazyDeopt()) {
     return;
   }
 
   int space_needed = Deoptimizer::patch_size();
   // Ensure that we have enough space after the previous lazy-bailout
   // instruction for patching the code here.
   int current_pc = masm()->pc_offset();
   if (current_pc < last_lazy_deopt_pc_ + space_needed) {
     int padding_size = last_lazy_deopt_pc_ + space_needed - current_pc;
     __ Nop(padding_size);
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8