[clang] Lifetimebound in assignment operator should work for non-gsl annotated types. (#113180)
This issue is identified during the discussion of [this
comment](https://github.com/llvm/llvm-project/issues/112234#issuecomment-2426102198).
There will be no release note for this fix as it is a follow-up to
[#106997](https://github.com/llvm/llvm-project/pull/106997).