VM ESM with dynamic imports resolves promises before linking is complete

<!-- Thank you for reporting an issue. This issue tracker is for bugs and issues found within Node.js core. If you require more general support please file an issue on our help repo. https://github.com/nodejs/help Please fill in as much of the template below as you're able. Version: output of `node -v` Platform: output of `uname -a` (UNIX), or version and 32 or 64-bit (Windows) Subsystem: if known, please specify affected core module name --> * **Version**: v14.1.0 * **Platform**: Darwin Simens-MacBook-Pro.local 18.7.0 Darwin Kernel Version 18.7.0: Mon Feb 10 21:08:45 PST 2020; root:xnu-4903.278.28~1/RELEASE_X86_64 x86_64 * **Subsystem**: VM, ESM ### What steps will reproduce the bug? See https://github.com/SimenB/node-vm-esm-promise-awaiting Run `node --experimental-vm-modules index.js` to reproduce. <!-- Enter details about your bug, preferably a simple code snippet that can be run using `node` directly without installing third-party dependencies. --> ### How often does it reproduce? Is there a required condition? Almost every time. There seems to be some race condition in there. I've added a manual timeout in there - tweak its numbers to see different behavior. In the code the timeout is 1 second and then one of the tests fail almost every time. Increasing the timeoyt will often make both tests fail ### What is the expected behavior? All linking and execution should happen before the promises resolve. <!-- If possible please provide textual output instead of screenshots. --> ### What do you see instead? The promises resolve, so the internal state of `completed` is set to `true`, which later throws. <!-- If possible please provide textual output instead of screenshots. --> ### Additional information The reproduction is adapted from a bug report to Jest (https://github.com/facebook/jest/issues/9430#issuecomment-622664754), so apologies if it looks a little wonky. I've tried to emulate sorta what happens under the hood in Jest down to solely node core modules. Note …