[llvm] [BPF] Avoid generating .comment section (PR #159958)

[via llvm-commits]

yonghong-song wrote:

> Nice. Can we strip note.GNU-stack too ?

Yes. See https://github.com/llvm/llvm-project/pull/159960.
I have a separate pull request since it involves change outside BPF backend.

https://github.com/llvm/llvm-project/pull/159958