Overflow during printing floats in the wasm backend

[ubaidsk]

The wasm backend prints floats by first printing the integral part and then printing the fractional part (by converting it also to an integer). The backend then reuses print_i64 to print these integers. This works for smaller floats, but fails for floats where the integral part does not fit into an i64.

This was discovered/discussed at #1325 (comment) and #1325 (comment).