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

[Ruoyu Qiu via llvm-commits]

cabbaken wrote:

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

ok, I will modify it.

> This PR appears to be missing tests?

Yes, I am trying to construct a test, but I need to learn some basic syntax of the test-suite. I will add the test later.

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