Remove explicit allocator #3273
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The jemalloc default was removed 4 years ago in Rust 1.32. wasm-bindgen does not support Rust 1.32 without using an old Cargo.lock. Since then, the system allocator is the default. Therefore, the explicit setting can be removed. In the worst case, wasm-bindgen developers using old compilers, partially updating their Cargo.lock, may get bloated binaries.
@alexcrichton, you added the explicit system allocator in wasm-bindgen and removed the jemalloc default in Rust. What do you think?