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

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index 5eec65ac81827417f6ad7f4898adcfb8751632db..d847ae1b4f08e77e83a48374f0cef12aac3276cc 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -1836,9 +1836,6 @@ void CodeGenerator::AssembleJumpTable(Label** targets, size_t target_count) {
 }
 
 
-void CodeGenerator::AddNopForSmiCodeInlining() { __ movz(xzr, 0); }
-
-
 void CodeGenerator::EnsureSpaceForLazyDeopt() {
   if (!info()->ShouldEnsureSpaceForLazyDeopt()) {
     return;