Use a register spec for StoreIC and KeyedStoreIC.

src/ic.h

Index: src/ic.h
diff --git a/src/ic.h b/src/ic.h
index 9ce2ae1973a26d7609476356c8f5e2b9d19baeec..47ffd6e529df98b046b18f11eab2d1036be7d925 100644
--- a/src/ic.h
+++ b/src/ic.h
@@ -583,6 +583,16 @@ class StoreIC: public IC {
   static const ExtraICState kStrictModeState =
       1 << StrictModeState::kShift;
 
+  enum RegisterInfo {
+    kReceiverIndex,
+    kNameIndex,
+    kValueIndex,
+    kRegisterArgumentCount
+  };
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+  static const Register ValueRegister();
+
   StoreIC(FrameDepth depth, Isolate* isolate)
       : IC(depth, isolate) {
     ASSERT(IsStoreStub());
@@ -691,6 +701,10 @@ class KeyedStoreIC: public StoreIC {
     return ExtraICStateKeyedAccessStoreMode::decode(extra_state);
   }
 
+  static const Register ReceiverRegister();
+  static const Register NameRegister();
+  static const Register ValueRegister();
+
   KeyedStoreIC(FrameDepth depth, Isolate* isolate)
       : StoreIC(depth, isolate) {
     ASSERT(target()->is_keyed_store_stub());