Avoid read barrier for UpdateEntrypoints

Somehow not caught by local testing.

Bug: 26786304
Change-Id: Ib9b53c0252bc053013fddd63c8146f4057a38453
diff --git a/runtime/gc/space/image_space.cc b/runtime/gc/space/image_space.cc
index d185e63..9269339 100644
--- a/runtime/gc/space/image_space.cc
+++ b/runtime/gc/space/image_space.cc
@@ -925,7 +925,7 @@
     if (fixup_heap_objects_) {
       method->UpdateObjectsForImageRelocation(ForwardObjectAdapter(this));
     }
-    method->UpdateEntrypoints(ForwardCodeAdapter(this));
+    method->UpdateEntrypoints<kWithoutReadBarrier>(ForwardCodeAdapter(this));
   }
 
  private: