HHVM does not support ARM64 Macs (M1+)

**Describe the bug**
illegal hardware instruction

**Standalone code, or other way to reproduce the problem**
> This should not depend on installing any libraries or frameworks. Ideally, it should be possible to copy-paste this into a single file and reproduce the problem by running hhvm and/or hh_client

Steps to reproduce the behavior:
1. Go to any hack/hhvm file
2. Click on on any of them
3. run the hhvm "NAME OF THE FILE"
4. See an an error saying: "illegal hardware instruction"

**Environment**
- Operating system
> 'MacOS Big Sur'.
- Installation method
> 'homebrew'