PERF_CONTEXT_USER_DEFERRED
perf_callchain_store_context(&ctx, PERF_CONTEXT_USER_DEFERRED);
data->callchain->ips[callchain_nr - 2] == PERF_CONTEXT_USER_DEFERRED) {
case PERF_CONTEXT_USER_DEFERRED:
case PERF_CONTEXT_USER_DEFERRED: