WebAssembly JavaScript Interface
WebAssembly JavaScript Interface
https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/WebAssembly/Memory
ArrayBuffer or SharedArrayBuffer
固定長なので、growするには別領域
https://developer.mozilla.org/ja/docs/WebAssembly/Understanding_the_text_format#webassembly_memory
var memory = new WebAssembly.Memory({initial:10, maximum:100});
page = 64KiB x 10 = 640