[ic] Move KeyedStoreIC::GenerateSlow() to ic-XXX.cc to avoid code duplication.

src/ic/s390/ic-s390.cc

Index: src/ic/s390/ic-s390.cc
diff --git a/src/ic/s390/ic-s390.cc b/src/ic/s390/ic-s390.cc
index 6bb484a2fdf72550980582872835a2990e1efe91..7bb45b13d4f8def5170a3bda8881767658074eaa 100644
--- a/src/ic/s390/ic-s390.cc
+++ b/src/ic/s390/ic-s390.cc
@@ -449,6 +449,14 @@ void KeyedStoreIC::GenerateMiss(MacroAssembler* masm) {
   __ TailCallRuntime(Runtime::kKeyedStoreIC_Miss);
 }
 
+void KeyedStoreIC::GenerateSlow(MacroAssembler* masm) {
+  StoreIC_PushArgs(masm);
+
+  // The slow case calls into the runtime to complete the store without causing
+  // an IC miss that would otherwise cause a transition to the generic stub.
+  __ TailCallRuntime(Runtime::kKeyedStoreIC_Slow);
+}
+
 static void KeyedStoreGenerateMegamorphicHelper(
     MacroAssembler* masm, Label* fast_object, Label* fast_double, Label* slow,
     KeyedStoreCheckMap check_map, KeyedStoreIncrementLength increment_length,