[compiler] Drop the CompareNilIC.

src/ic/ic-compiler.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/ic/ic-compiler.h"
 
 #include "src/ic/handler-compiler.h"
 #include "src/ic/ic-inl.h"
 #include "src/profiler/cpu-profiler.h"
 
@@ skipping 114 matching lines @@
     code = compiler.CompileStoreMegamorphic(flags);
   } else {
     UNREACHABLE();
   }
 
   FillCache(isolate, code);
   return code;
 }
 
 
-Handle<Code> PropertyICCompiler::ComputeCompareNil(Handle<Map> receiver_map,
-                                                   CompareNilICStub* stub) {
-  Isolate* isolate = receiver_map->GetIsolate();
-  Handle<String> name(isolate->heap()->empty_string());
-  if (!receiver_map->is_dictionary_map()) {
-    Handle<Code> cached_ic =
-        Find(name, receiver_map, Code::COMPARE_NIL_IC, stub->GetExtraICState());
-    if (!cached_ic.is_null()) return cached_ic;
-  }
-
-  Code::FindAndReplacePattern pattern;
-  Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map);
-  pattern.Add(isolate->factory()->meta_map(), cell);
-  Handle<Code> ic = stub->GetCodeCopy(pattern);
-
-  if (!receiver_map->is_dictionary_map()) {
-    Map::UpdateCodeCache(receiver_map, name, ic);
-  }
-
-  return ic;
-}
-
-
 void PropertyICCompiler::ComputeKeyedStorePolymorphicHandlers(
     MapHandleList* receiver_maps, MapHandleList* transitioned_maps,
     CodeHandleList* handlers, KeyedAccessStoreMode store_mode,
     LanguageMode language_mode) {
   Isolate* isolate = receiver_maps->at(0)->GetIsolate();
   DCHECK(store_mode == STANDARD_STORE ||
          store_mode == STORE_AND_GROW_NO_TRANSITION ||
          store_mode == STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS ||
          store_mode == STORE_NO_TRANSITION_HANDLE_COW);
   ExtraICState extra_state =
@@ skipping 144 matching lines @@
 
   TailCallBuiltin(masm(), Builtins::kKeyedStoreIC_Miss);
 
   return GetCode(kind(), Code::NORMAL, factory()->empty_string());
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8