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

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index a09f32c9f822d0e1344bf1fa34dea961c2be7ee5..1d22ae9b6be41b86d5e5fe65b76aac727490fdb3 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -2455,9 +2455,6 @@ void CodeGenerator::AssembleJumpTable(Label** targets, size_t target_count) {
 }
 
 
-void CodeGenerator::AddNopForSmiCodeInlining() { __ nop(); }
-
-
 void CodeGenerator::EnsureSpaceForLazyDeopt() {
   if (!info()->ShouldEnsureSpaceForLazyDeopt()) {
     return;