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

[James Henderson via llvm-commits]

https://github.com/jh7370 commented:

Could you do a merge commit from main into your branch, to see if it fixes the issues that the pre-merge tests were highlighting before, please?

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