There is a bad mismerge in current aarch64-port:

   static bool contains(address addr) {
     return
       (_code1 != NULL && _code1->blob_contains(addr)) ||
       (_code2 != NULL && _code1->blob_contains(addr)) ;
   }

It was introduced here:
 https://hg.openjdk.java.net/aarch64-port/jdk8u-shenandoah/hotspot/rev/eb453d557b4c#l191.27

We should revert it to 8u upstream state.