fix afar flang lit test issue

Author: ronlieb

flang/test/Lower/OpenMP/loop-lifetime.f90

@@ -1,6 +1,7 @@
 ! This test checks the insertion of lifetime information for loop indices of
 ! OpenMP loop operations.
 ! RUN: %flang_fc1 -flang-experimental-hlfir -emit-llvm -fopenmp %s -o - | FileCheck %s
+! REQUIRES: stableFlang
 
 ! CHECK-LABEL: define void @wsloop_i32
 subroutine wsloop_i32()