drd: Reenable reporting races on stack variables that are shared over threads for --check-stack-var=yes.

git-svn-id: svn://svn.valgrind.org/valgrind/trunk@12475 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/drd_load_store.c b/drd/drd_load_store.c
index 6eae573..996ee61 100644
--- a/drd/drd_load_store.c
+++ b/drd/drd_load_store.c
@@ -140,7 +140,8 @@
    ThreadId vg_tid;
 
    vg_tid = VG_(get_running_tid)();
-   if (DRD_(thread_address_on_any_stack)(addr)) {
+   if (!DRD_(get_check_stack_accesses)()
+       && DRD_(thread_address_on_any_stack)(addr)) {
 #if 0
       GenericErrInfo GEI = {
          .tid = DRD_(thread_get_running_tid)(),