8360679: Shenandoah: AOT saved adapter calls into broken GC barrier stub

Reviewed-by: kvn, adinn, aph

Author: shipilev

src/hotspot/cpu/aarch64/gc/shenandoah/shenandoahBarrierSetAssembler_aarch64.cpp

@@ -292,7 +292,8 @@ void ShenandoahBarrierSetAssembler::load_reference_barrier(MacroAssembler* masm,
   } else {
     assert(is_phantom, "only remaining strength");
     assert(!is_narrow, "phantom access cannot be narrow");
-    __ mov(lr, CAST_FROM_FN_PTR(address, ShenandoahRuntime::load_reference_barrier_phantom));
+    // AOT saved adapters need relocation for this call.
+    __ lea(lr, RuntimeAddress(CAST_FROM_FN_PTR(address, ShenandoahRuntime::load_reference_barrier_phantom)));
   }
   __ blr(lr);
   __ mov(rscratch1, r0);