start mallctl suite w/ jemalloc stats

Signed-off-by: Jason Volk <jason@zemos.net>

src/alloc/hardened.rs

@@ -0,0 +1,10 @@
+#![cfg(all(not(target_env = "msvc"), feature = "hardened_malloc", target_os = "linux", not(feature = "jemalloc")))]
+
+#[global_allocator]
+static HMALLOC: hardened_malloc_rs::HardenedMalloc = hardened_malloc_rs::HardenedMalloc;
+
+pub(crate) fn memory_usage() -> String {
+	String::default() //TODO: get usage
+}
+
+pub(crate) fn memory_stats() -> String { "Extended statistics are not available from hardened_malloc.".to_owned() }