go: runtime: don't crash in exception handler on windows/arm64

I have a quite complex bug but together with @marler8997 we found a workaround.

I tried to get a go-library working on a Hololens 2 via .Net. So I build the library into a dll using the awesome zig-compiler, and then tried to PInvoke into it from C#/.Net. I did all this already successfull on Windows, Linux, MacOs, Android and iOs.

On Hololens, though, my app always crashed whenever the UWP (Universal Windows Platform) DLL came together with the go-runtime. We know found out that Go seems to try to handle an exception thrown from UWP and fails to do so leading to a “badsignal” and an application crash.

@marler8997 helped me with an many in-depth-sessions debugging assembly code and created that patch: https://github.com/marler8997/go/commit/f645ec01d3d9bfbdeb66905e50240da9e865b6bd

May someone with knowledge of the win-arm64-build if this is a good solution or if there might be a better way of doing it? Thank you very much!

What version of Go are you using (go version)?

1.17.6

Does this issue reproduce with the latest release?

Yes

What operating system and processor architecture are you using (go env)?

Windows, ARM64, Hololens 2