[llvm] [llvm][ELF]Add Shdr check for getBuildID(#126418) (PR #126537)

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Don't include the issue reference in the PR/commit title: there's no need, because you mentioned it in the body.

This PR appears to be missing tests?

https://github.com/llvm/llvm-project/pull/126537