wasm_import_module
This is now stabilized! Also tweak usage of it to the stable version.
This has been stabilized on nightly as `#[link_section]`, so no need for an unstable attribute any more. Yay!
This commit is an implementation of mapping u64/i64 to `BigInt` in JS through the unstable BigInt APIs. The BigInt type will ship soon in Chrome and so this commit builds out the necessary support for wasm-bindgen to use it!