add notice

Author: Alexander Batashev

SYCL/KernelAndProgram/cache_env_vars.cpp

@@ -1,5 +1,7 @@
 // No JITing for host devices.
 // REQUIRES: opencl || level_zero
+// Persistent cache is not supported for Kernel Bundles right now. TODO enable
+// when it is fixed.
 // XFAIL: *
 // RUN: rm -rf %t/cache_dir
 // RUN: %clangxx -fsycl -fsycl-targets=%sycl_triple %s -o %t.out -DTARGET_IMAGE=INC100

SYCL/KernelAndProgram/cache_env_vars_lin.cpp

@@ -1,6 +1,8 @@
 // No JITing for host devices and diffrent environment variables on linux and
 // windows.
 // REQUIRES: (level_zero || opencl) && linux
+// Persistent cache is not supported for Kernel Bundles right now. TODO enable
+// when it is fixed.
 // XFAIL: *
 
 // RUN: rm -rf %t/cache_dir

SYCL/KernelAndProgram/cache_env_vars_win.cpp

@@ -1,6 +1,8 @@
 // No JITing for host devices and diffrent environment variables on linux and
 // windows.
 // REQUIRES: (level_zero || opencl) && windows
+// Persistent cache is not supported for Kernel Bundles right now. TODO enable
+// when it is fixed.
 // XFAIL: *
 
 // RUN: rm -rf %t/cache_dir