Serializer: correctly deal with internal references.

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
diff --git a/src/x64/assembler-x64-inl.h b/src/x64/assembler-x64-inl.h
index 64c71cfaee9afca8ef3d87d44fcb0b2c7c637413..e8f90c6aca5c39c2f7983a5c17be787e600886fd 100644
--- a/src/x64/assembler-x64-inl.h
+++ b/src/x64/assembler-x64-inl.h
@@ -366,12 +366,24 @@ Handle<Object> RelocInfo::target_object_handle(Assembler* origin) {
 }
 
 
-Address RelocInfo::target_reference() {
+Address RelocInfo::target_external_reference() {
   DCHECK(rmode_ == RelocInfo::EXTERNAL_REFERENCE);
   return Memory::Address_at(pc_);
 }
 
 
+Address RelocInfo::target_internal_reference() {
+  DCHECK(rmode_ == INTERNAL_REFERENCE);
+  return Memory::Address_at(pc_);
+}
+
+
+void RelocInfo::set_target_internal_reference(Address target) {
+  DCHECK(rmode_ == INTERNAL_REFERENCE);
+  Memory::Address_at(pc_) = target;
+}
+
+
 void RelocInfo::set_target_object(Object* target,
                                   WriteBarrierMode write_barrier_mode,
                                   ICacheFlushMode icache_flush_mode) {