perf: use mimalloc for musl build

Author: xc2

crates/rspack_allocator/Cargo.toml

@@ -11,5 +11,8 @@ version    = "0.1.0"
 [target.'cfg(not(target_os = "linux"))'.dependencies]
 mimalloc-rust = { workspace = true }
 
+[target.'cfg(all(target_os = "linux", target_env = "musl"))'.dependencies]
+mimalloc-rust = { workspace = true }
+
 [target.'cfg(all(target_os = "linux", target_env = "gnu", any(target_arch = "x86_64", target_arch = "aarch64")))'.dependencies]
 tikv-jemallocator = { workspace = true }

crates/rspack_allocator/src/lib.rs

@@ -2,6 +2,10 @@
 #[global_allocator]
 static GLOBAL: mimalloc_rust::GlobalMiMalloc = mimalloc_rust::GlobalMiMalloc;
 
+#[cfg(all(target_os = "linux", target_env = "musl",))]
+#[global_allocator]
+static GLOBAL: mimalloc_rust::GlobalMiMalloc = mimalloc_rust::GlobalMiMalloc;
+
 #[cfg(all(
   target_os = "linux",
   target_env = "gnu",