[IC] Delete unused AddessIsOptimizedCode function.

src/ic/ic.cc

Index: src/ic/ic.cc
diff --git a/src/ic/ic.cc b/src/ic/ic.cc
index f6642d56cb71255a9ce79e6bf8479233c4e9359c..bd85896af379693700874f8c413c044df9a774ea 100644
--- a/src/ic/ic.cc
+++ b/src/ic/ic.cc
@@ -244,13 +244,6 @@ Code* IC::GetCode() const {
   return code;
 }
 
-
-bool IC::AddressIsOptimizedCode() const {
-  Code* host =
-      isolate()->inner_pointer_to_code_cache()->GetCacheEntry(address())->code;
-  return host->kind() == Code::OPTIMIZED_FUNCTION;
-}
-
 static void LookupForRead(LookupIterator* it) {
   for (; it->IsFound(); it->Next()) {
     switch (it->state()) {