[OpenMP] NFC: disabled two flakey tests as the bug in libomp not fixed yet

GitOrigin-RevId: ac70a53653d45d0dc6cf50c65b7215d5b7bb8c19
diff --git a/runtime/test/env/kmp_set_dispatch_buf.c b/runtime/test/env/kmp_set_dispatch_buf.c
index 264510d..0177623 100644
--- a/runtime/test/env/kmp_set_dispatch_buf.c
+++ b/runtime/test/env/kmp_set_dispatch_buf.c
@@ -9,7 +9,7 @@
 // RUN: env KMP_DISP_NUM_BUFFERS=3 %libomp-run
 // RUN: env KMP_DISP_NUM_BUFFERS=4 %libomp-run
 // RUN: env KMP_DISP_NUM_BUFFERS=7 %libomp-run
-// UNSUPPORTED: clang-11, clang-12
+// UNSUPPORTED: clang-11, clang-12, clang-13
 #include <stdio.h>
 #include <omp.h>
 #include <stdlib.h>
diff --git a/runtime/test/worksharing/for/kmp_set_dispatch_buf.c b/runtime/test/worksharing/for/kmp_set_dispatch_buf.c
index 244acdc..3386618 100644
--- a/runtime/test/worksharing/for/kmp_set_dispatch_buf.c
+++ b/runtime/test/worksharing/for/kmp_set_dispatch_buf.c
@@ -3,7 +3,7 @@
 // RUN: %libomp-run 1 && %libomp-run 2 && %libomp-run 5
 // RUN: %libomp-compile -DMY_SCHEDULE=guided && %libomp-run 7
 // RUN: %libomp-run 1 && %libomp-run 2 && %libomp-run 5
-// UNSUPPORTED: clang-11, clang-12
+// UNSUPPORTED: clang-11, clang-12, clang-13
 #include <stdio.h>
 #include <omp.h>
 #include <stdlib.h>