[SYCL][ESIMD] Rename sbarrier => split_barrier (#5866)

Test change: intel/llvm-test-suite#938

Signed-off-by: Sergey Dmitriev <serguei.n.dmitriev@intel.com>

Author: sndmitriev

sycl/include/sycl/ext/intel/experimental/esimd/memory.hpp

@@ -24,7 +24,9 @@ namespace __ESIMD_ENS {
 /// @{
 
 /// Generic work-group split barrier
-__ESIMD_API void sbarrier(split_barrier_action flag) { __esimd_sbarrier(flag); }
+__ESIMD_API void split_barrier(split_barrier_action flag) {
+  __esimd_sbarrier(flag);
+}
 
 /// @} sycl_esimd_memory