[llvm] [BOLT] Detect Linux kernel version if the binary is a Linux kernel (PR #119088)

[via llvm-commits]

FLZ101 wrote:

> Thank you for refactoring the code. Please add tests for the Linux version and include non-standard versions.

There is a failed test case, which I have created a PR https://github.com/llvm/llvm-project/pull/119557 to fix.

I'll add missing tests soon.

https://github.com/llvm/llvm-project/pull/119088