Remove FLAG_cache_optimized_code because we always have it on.

src/factory.cc

Index: src/factory.cc
diff --git a/src/factory.cc b/src/factory.cc
index 43d29f6f0f007bd14ebc71b27e3f587aa3898898..c66f90a65fbe2d7fc197e09e90fc20af2eec8b8a 100644
--- a/src/factory.cc
+++ b/src/factory.cc
@@ -1346,12 +1346,11 @@ Handle<JSFunction> Factory::NewFunctionFromSharedFunctionInfo(
         LiteralsArray::New(isolate(), handle(info->feedback_vector()),
                            number_of_literals, pretenure);
     result->set_literals(*literals);
+
     // Cache context-specific literals.
-    if (FLAG_cache_optimized_code) {
-      Handle<Context> native_context(context->native_context());
-      SharedFunctionInfo::AddToOptimizedCodeMap(
-          info, native_context, undefined_value(), literals, BailoutId::None());
-    }
+    Handle<Context> native_context(context->native_context());
+    SharedFunctionInfo::AddToOptimizedCodeMap(
+        info, native_context, undefined_value(), literals, BailoutId::None());
   }
 
   return result;