Consider replacing setjmp/lngjmp implmentation with llvm instrinsics

[dblnz]

Instead of implementing setjmp and longjmp in the hyperlight-guest we can use the LLVM intrinsic.
The following link gives more details on how to use the intrinsic setjmp/longjmp implementations from LLVM.

[prydt]

Hi, my name is Pranoy Dutta. I am a senior at UT Austin, and I was wondering if I could work on this issue.

I have looked through the link with the LLVM's SJLJ intrinsics and believe I understand how they work. I have also looked at hyperlight_guest/src/setjmp.rs and I see that it is using inline assembly to implement setjmp/longjmp.

Is there anything else I would need to do besides replace the inline assembly with the LLVM SJLJ intrinsics?