Use handle lists instead of raw pointer lists in polymorphic code cache.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 87613f0438a2c2e62d5b362edff130cddb25e7db..586df9f9f1ff083e206fd52947d01744d12c9515 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -5868,15 +5868,13 @@ class PolymorphicCodeCache: public Struct {
                      Code::Flags flags,
                      Handle<Code> code);
 
-  MUST_USE_RESULT MaybeObject* Update(MapList* maps,
+  MUST_USE_RESULT MaybeObject* Update(MapHandleList* maps,
                                       Code::Flags flags,
                                       Code* code);
 
   // Returns an undefined value if the entry is not found.
   Handle<Object> Lookup(MapHandleList* maps, Code::Flags flags);
 
-  Object* Lookup(MapList* maps, Code::Flags flags);
-
   static inline PolymorphicCodeCache* cast(Object* obj);
 
 #ifdef OBJECT_PRINT
@@ -5900,8 +5898,11 @@ class PolymorphicCodeCache: public Struct {
 class PolymorphicCodeCacheHashTable
     : public HashTable<CodeCacheHashTableShape, HashTableKey*> {
  public:
-  Object* Lookup(MapList* maps, int code_kind);
-  MUST_USE_RESULT MaybeObject* Put(MapList* maps, int code_kind, Code* code);
+  Object* Lookup(MapHandleList* maps, int code_kind);
+
+  MUST_USE_RESULT MaybeObject* Put(MapHandleList* maps,
+                                   int code_kind,
+                                   Code* code);
 
   static inline PolymorphicCodeCacheHashTable* cast(Object* obj);