8336944: Shenandoah: Should only relativize stack chunks for successful evacuations

Reviewed-by: shade, ysr

src/hotspot/share/gc/shenandoah/shenandoahHeap.cpp

@@ -1178,11 +1178,10 @@ oop ShenandoahHeap::evacuate_object(oop p, Thread* thread) {
 
   // Try to install the new forwarding pointer.
   oop copy_val = cast_to_oop(copy);
-  ContinuationGCSupport::relativize_stack_chunk(copy_val);
-
   oop result = ShenandoahForwarding::try_update_forwardee(p, copy_val);
   if (result == copy_val) {
     // Successfully evacuated. Our copy is now the public one!
+    ContinuationGCSupport::relativize_stack_chunk(copy_val);
     shenandoah_assert_correct(nullptr, copy_val);
     return copy_val;
   }  else {