Serializer: serialize internal references via object visitor.

src/arm64/assembler-arm64.h

Index: src/arm64/assembler-arm64.h
diff --git a/src/arm64/assembler-arm64.h b/src/arm64/assembler-arm64.h
index 23662ad7a0f276d6d0cb2f6c9847a3a75646f2cb..64103e3a6b8e95b35d7c9a114d94ed2596acc074 100644
--- a/src/arm64/assembler-arm64.h
+++ b/src/arm64/assembler-arm64.h
@@ -901,6 +901,10 @@ class Assembler : public AssemblerBase {
   inline static void deserialization_set_special_target_at(
       Address constant_pool_entry, Code* code, Address target);
 
+  // This sets the internal reference at the pc.
+  inline static void deserialization_set_target_internal_reference_at(
+      Address pc, Address target);
+
   // All addresses in the constant pool are the same size as pointers.
   static const int kSpecialTargetSize = kPointerSize;