message: Avoid iadd for ptr const val with zero offset
diff: @@ -225,10 +225,13 @@ pub(crate) fn trans_const_value<'tcx>(
  }
  None => bug!("missing allocation {:?}", ptr.alloc_id),
  };
  - let val = fx
  - .bcx
  + let val = if ptr.offset.bytes() != 0 {
  + fx.bcx
  .ins()
  - .iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap());
  + .iadd_imm(base_addr, i64::try_from(ptr.offset.bytes()).unwrap())
  + } else {
  + base_addr
  + };
  return CValue::by_val(val, layout);
  }
  }
  