ARM64 support for windows

[cstavitsky]

(Opening on behalf of a customer)

After chatting with Arpad and Karl internally, they mentioned that Sentry on devices using ARM64 architecture (Windows) is currently untested. They mentioned testing would require buying additional specific hardware, and that there is some candidate hardware they have in mind.

Overall, this Github issue represents:

• the request to test and confirm whether Sentry works as one would expect with ARM64 architecture.
• (if Sentry is tested and does not work) a feature request to get it working.

[supervacuus]

@kahest: let's talk about this in the next sync.

[supervacuus]

@kahest, short update: with the 0.7.0 release we're cross-compiling crashpad for ARM64 on Windows in our CI. We fixed many build issues, and thebrowsercompany is using that version for the upcoming Windows version of Arc.

We still have no test environment, but at least we know when upstream changes (or ours) to the crashpad fork will break ARM64 builds on Windows. So, while official support is unwarranted, users who want to experiment with that option should be enabled to do so. I don't know if that is relevant to the unnamed customer.

[DDxPlague]

Given that Github runners are now available with Windows and Arm64, is this something that could be pushed back up the priority list? Can you test with the Github Windows on Arm runners?