Clang/LLVM as code generator for uBPF about ubpf

[jpsamaroo]

The simpler version of this: add a function to load native machine code from an object file and execute that. The compiler invocations and Clang/LLVM APIs are far too complicated, flexible, and version dependent to be worth accessing from ubpf; let the user deal with that instead, we only care about the native code anyway.

[rlane]

Agreed with @jpsamaroo, LLVM would be a very heavy dependency. It'd be interesting to see how much performance could be gained from an optimizing compiler vs ubpf's straightforward instruction translation but it would be better as a separate project. If there are portions of ubpf that would be useful for this I wouldn't mind adding new public APIs for them.

[Alan-Jowett]

Thanks, that makes a lot of sense. Can't really say how much gain there would be until we try it though. Folks on the Ebpf-For-Windows project suggested posting it here as it isn't a Windows specific proposal, but a separate project also makes sense.