feat(solver-wasm): replace outdated wee-alloc with FreeListAllocator from lol-alloc

pkgs/solver-wasm/src/lib.rs

@@ -1,11 +1,12 @@
-extern crate wee_alloc;
-
-#[global_allocator]
-static ALLOC: wee_alloc::WeeAlloc = wee_alloc::WeeAlloc::INIT;
-
 use sha2::{Digest, Sha256};
 use wasm_bindgen::prelude::*;
 
+#[cfg(target_arch = "wasm32")]
+#[global_allocator]
+static ALLOCATOR: lol_alloc::AssumeSingleThreaded<lol_alloc::FreeListAllocator> =
+    // SAFETY: This application is single threaded, so using AssumeSingleThreaded is allowed.
+    unsafe { lol_alloc::AssumeSingleThreaded::new(lol_alloc::FreeListAllocator::new()) };
+
 #[wasm_bindgen]
 pub fn solve(nonce: Box<[u8]>, target: Box<[u8]>, difficulty_bits: u32) -> Box<[u8]> {
     let mut buf = vec![0u8; 8 + nonce.len()];