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

src/ic/arm64/ic-arm64.cc

Index: src/ic/arm64/ic-arm64.cc
diff --git a/src/ic/arm64/ic-arm64.cc b/src/ic/arm64/ic-arm64.cc
index 9d66eb24950bba553148e16e6dda3d3c45b5bf38..15fee7b88fea854379d295c841fa775ad5ca6889 100644
--- a/src/ic/arm64/ic-arm64.cc
+++ b/src/ic/arm64/ic-arm64.cc
@@ -458,6 +458,14 @@ void KeyedStoreIC::GenerateMiss(MacroAssembler* masm) {
   __ TailCallRuntime(Runtime::kKeyedStoreIC_Miss);
 }
 
+void KeyedStoreIC::GenerateSlow(MacroAssembler* masm) {
+  ASM_LOCATION("KeyedStoreIC::GenerateSlow");
+  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,