DRD: Handle Imbe_CancelReservation properly (clrex on ARM)

This was reported by Florian and was detected by analyzing the
compiler output with -Wswitch-enum enabled.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@14549 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/drd_load_store.c b/drd/drd_load_store.c
index 973bdda..afb88e1 100644
--- a/drd/drd_load_store.c
+++ b/drd/drd_load_store.c
@@ -633,7 +633,9 @@
          switch (st->Ist.MBE.event)
          {
          case Imbe_Fence:
-            break; /* not interesting */
+            break; /* not interesting to DRD */
+         case Imbe_CancelReservation:
+            break; /* not interesting to DRD */
          default:
             tl_assert(0);
          }