[lld] [lld][ELF] Improve the vulnerability in Orphan Sections initialization (PR #156354)

[Peter Smith via llvm-commits]

https://github.com/smithp35 commented:

I recommend not using the word `vulnerability` in titles and description as this is usually reserved for security bugs.

I suggest something like `[lld][ELF] Fix crash when relocations proceed relocated section.

I also recommend putting the analysis in the linked issue into the description as this will form the commit message. It is much easier to find and search for changes with `git log` when the commit message has all the details.  

https://github.com/llvm/llvm-project/pull/156354