Assertion failure in EncoderMD.cpp

the following poc cause a assertion failure in "debug" build on ubuntu.

```
function main() {
const v3 = [-3290630866,-3290630866,-3290630866,-3290630866,0];
for (const v4 of v3) {
const v13 = async (v14) => {
const v24 = ``;
const v29 = await v14;
for (let v52 = 1; v52 == -1; v52 = v52-4096) {
const v89 = ``;
}
};
for (let v125 = 0; v125 < 9; v125++) {
const v127 = [4,723347.8822827139];
const v129 = v127["map"](v13);
}
}
}
main();
```