Subzero. ARM32. Refactors atomic intrinsics lowering.

crosstest/test_sync_atomic.cpp

Index: crosstest/test_sync_atomic.cpp
diff --git a/crosstest/test_sync_atomic.cpp b/crosstest/test_sync_atomic.cpp
index d1578ebc3de85a4edd0d4433ff6d68083e571ac2..432002acc836b4bf1da698b0081ea8c0738a908d 100644
--- a/crosstest/test_sync_atomic.cpp
+++ b/crosstest/test_sync_atomic.cpp
@@ -47,7 +47,8 @@
     if (fetch) {                                                               \
       return __sync_fetch_and_##inst(ptr, 42);                                 \
     } else {                                                                   \
-      return __sync_##inst##_and_fetch(ptr, 99);                               \
+      const type value = static_cast<type>(0xaaaaaaaaaaaaaaaaull);             \
+      return __sync_##inst##_and_fetch(ptr, value);                            \
     }                                                                          \
   }