Enable memory profiling by default

`lg_prof_sample` is set to 23 and hopefully performance impact is minimal. Benchmark is not showing
anything. If this causes any issues, it can still be overwritten by setting `MALLOC_CONF` env var on
the command line.

Author: wqfish

aptos-node/src/main.rs

@@ -1,15 +1,18 @@
 // Copyright (c) Aptos Foundation
 // Licensed pursuant to the Innovation-Enabling Source Code License, available at https://github.com/aptos-labs/aptos-core/blob/main/LICENSE
 
-#![forbid(unsafe_code)]
-
 use aptos_node::{utils::ERROR_MSG_BAD_FEATURE_FLAGS, AptosNodeArgs};
 use clap::Parser;
 
 #[cfg(unix)]
 #[global_allocator]
 static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
+/// Can be overridden by setting the `MALLOC_CONF` env var.
+#[cfg(unix)]
+#[unsafe(no_mangle)]
+static malloc_conf: &[u8] = b"prof:true,lg_prof_sample:23\0";
+
 fn main() {
     // Check that we are not including any Move test natives
     aptos_vm::natives::assert_no_test_natives(ERROR_MSG_BAD_FEATURE_FLAGS);

execution/executor-benchmark/src/main.rs

@@ -52,6 +52,10 @@ use std::{
 #[global_allocator]
 static ALLOC: jemallocator::Jemalloc = jemallocator::Jemalloc;
 
+#[cfg(unix)]
+#[unsafe(no_mangle)]
+static malloc_conf: &[u8] = b"prof:true,lg_prof_sample:23\0";
+
 /// This is needed for filters on the Grafana dashboard working as its used to populate the filter
 /// variables.
 pub static START_TIME: Lazy<IntGauge> =