Revert 5973 as well (related to previous commit)

src/x64/ic-x64.cc

Index: src/x64/ic-x64.cc
===================================================================
--- src/x64/ic-x64.cc	(revision 5976)
+++ src/x64/ic-x64.cc	(working copy)
@@ -1951,8 +1951,10 @@
 void CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
   HandleScope scope;
   Handle<Code> rewritten;
+#ifdef DEBUG
   State previous_state = GetState();
-  State state = TargetState(previous_state, x, y);
+#endif
+  State state = TargetState(x, y);
   if (state == GENERIC) {
     CompareStub stub(GetCondition(), strict(), NO_COMPARE_FLAGS);
     rewritten = stub.GetCode();
@@ -1972,10 +1974,6 @@
 #endif
 }
 
-void PatchInlinedSmiCode(Address address) {
-  UNIMPLEMENTED();
-}
-
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64