[FEATURE] setTargetTriple API change for LLVM ≥15

[chrinovicmu]

Hi,

I noticed that the current usage of Module::setTargetTriple in llvm_jit_context.cpp passes a std::string:

module.setTargetTriple(defaultTargetTriple);

In LLVM versions >=15, the API now requires an llvm::Triple object instead of std::string:

void llvm::Module::setTargetTriple(llvm::Triple T);

This causes compilation errors when building with newer LLVM versions.

My enquire is, is llvmbpftime strictly developed for the specific LLVM version?
If not I can prepare a small PR to fix this if the maintainers prefer?

Thanks!

[yunwei37]

Thanks for the tests! You are welcome to give a PR to fix this!