Fix x64 build after r5970, the same way as for ARM.

src/x64/ic-x64.cc

Index: src/x64/ic-x64.cc
diff --git a/src/x64/ic-x64.cc b/src/x64/ic-x64.cc
index 200209906be85ca32c5a3f8c7a560ce8949b9884..a7e61bab7a518ef394f6b9f9112196f0400aae00 100644
--- a/src/x64/ic-x64.cc
+++ b/src/x64/ic-x64.cc
@@ -1951,10 +1951,8 @@ Condition CompareIC::ComputeCondition(Token::Value op) {
 void CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
   HandleScope scope;
   Handle<Code> rewritten;
-#ifdef DEBUG
   State previous_state = GetState();
-#endif
-  State state = TargetState(x, y);
+  State state = TargetState(previous_state, x, y);
   if (state == GENERIC) {
     CompareStub stub(GetCondition(), strict(), NO_COMPARE_FLAGS);
     rewritten = stub.GetCode();
@@ -1974,6 +1972,10 @@ void CompareIC::UpdateCaches(Handle<Object> x, Handle<Object> y) {
 #endif
 }
 
+void PatchInlinedSmiCode(Address address) {
+  UNIMPLEMENTED();
+}
+
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64