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

src/compiler/s390/code-generator-s390.cc

Index: src/compiler/s390/code-generator-s390.cc
diff --git a/src/compiler/s390/code-generator-s390.cc b/src/compiler/s390/code-generator-s390.cc
index 236c28bb05c855c16d4fb6dd3c3edacf440fb4f2..1a93b54b0071d1a2a998d0b12ecd81a3737f516d 100644
--- a/src/compiler/s390/code-generator-s390.cc
+++ b/src/compiler/s390/code-generator-s390.cc
@@ -2094,10 +2094,6 @@ void CodeGenerator::AssembleJumpTable(Label** targets, size_t target_count) {
   }
 }
 
-void CodeGenerator::AddNopForSmiCodeInlining() {
-  // We do not insert nops for inlined Smi code.
-}
-
 void CodeGenerator::EnsureSpaceForLazyDeopt() {
   if (!info()->ShouldEnsureSpaceForLazyDeopt()) {
     return;