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

src/ic/ppc/ic-ppc.cc

Index: src/ic/ppc/ic-ppc.cc
diff --git a/src/ic/ppc/ic-ppc.cc b/src/ic/ppc/ic-ppc.cc
index fd2962d0faa3bc89801d3a0d9f94a74cc8d8bb04..7dc09ca8567bc924ab0313577ca514f1b6bd222c 100644
--- a/src/ic/ppc/ic-ppc.cc
+++ b/src/ic/ppc/ic-ppc.cc
@@ -464,6 +464,13 @@ 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,