message: Remove subgroup barrier and double the performance on new NEO
diff: @@ -242,9 +242,9 @@ void Emit::Visit(const sem::ForStmt& n) {
  void Emit::Visit(const sem::BarrierStmt& n) {
  emitTab();
  if (n.subgroup) {
  - emit("sub_group_barrier(CLK_LOCAL_MEM_FENCE | CLK_GLOBAL_MEM_FENCE);\n");
  + //emit("sub_group_barrier(CLK_LOCAL_MEM_FENCE | CLK_GLOBAL_MEM_FENCE);\n");
  } else {
  - emit("barrier(CLK_LOCAL_MEM_FENCE | CLK_GLOBAL_MEM_FENCE);\n");
  + emit("barrier(CLK_LOCAL_MEM_FENCE);\n");
  }
  }
  