dlmalloc is larger on wasip1 target than unknown-unknown

[XinyuZeng]

Hi, I am just curious about the reason behind this behavior: https://users.rust-lang.org/t/code-size-of-wasip1-larger-than-unknown-unknown/122789

For wasi, is that we should include our own allocator?

[alexcrichton]

I believe what's happening there is that the Rust wasm32-wasip1 target is using wasi-libc by default for malloc, not this crate. You can still use this crate though with #[global_allocator] instead.