Per-Isolate cache for polymorphic stubs

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 22af01e8bc3f4366b8d74adc617ed018012aacbc..f3686b37bb5b994942995c9d39ab454e3db9c2bf 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -676,6 +676,11 @@ bool Object::IsCodeCacheHashTable() {
 }
 
 
+bool Object::IsPolymorphicCodeCacheHashTable() {
+  return IsHashTable();
+}
+
+
 bool Object::IsMapCache() {
   return IsHashTable();
 }
@@ -1891,6 +1896,7 @@ CAST_ACCESSOR(JSFunctionResultCache)
 CAST_ACCESSOR(NormalizedMapCache)
 CAST_ACCESSOR(CompilationCacheTable)
 CAST_ACCESSOR(CodeCacheHashTable)
+CAST_ACCESSOR(PolymorphicCodeCacheHashTable)
 CAST_ACCESSOR(MapCache)
 CAST_ACCESSOR(String)
 CAST_ACCESSOR(SeqString)
@@ -3324,6 +3330,8 @@ void SharedFunctionInfo::set_native(bool value) {
 ACCESSORS(CodeCache, default_cache, FixedArray, kDefaultCacheOffset)
 ACCESSORS(CodeCache, normal_type_cache, Object, kNormalTypeCacheOffset)
 
+ACCESSORS(PolymorphicCodeCache, cache, Object, kCacheOffset)
+
 bool Script::HasValidSource() {
   Object* src = this->source();
   if (!src->IsString()) return true;