int64 op_div, div_u, op_mod, mod_u is too hackish

[bobzhang]

let's do some hard work to implement it in proper js, we can replace it one by one

[hackwaly]

Current version is selected mainly performance reason. Pure js/mbt is order of magnitude slow than wasm.

[hackwaly]

Here's an implementation could reference https://github.com/consento-org/longfn/blob/1c81e1959c81f5614374625bca0f545177191ca5/index.mjs#L1007-L1105.