[IC] Delete unused AddessIsOptimizedCode function.

BUG=

Review-Url: https://codereview.chromium.org/2387173003
Cr-Commit-Position: refs/heads/master@{#39956}

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()) {

src/ic/ic.h

@@ -91,7 +91,6 @@ class IC {
   // Get the code object of the caller.
   Code* GetCode() const;
 
-  bool AddressIsOptimizedCode() const;
   inline bool AddressIsDeoptimizedCode() const;
   inline static bool AddressIsDeoptimizedCode(Isolate* isolate,
                                               Address address);