[llvm] [IR] Allow uses of `llvm.global_ctors` and `llvm.global_dtors` (PR #96477)

[Nikita Popov via llvm-commits]

nikic wrote:

Also, does this mean that optimizations on ctor/dtor will have to rewrite these additional GEPs when e.g. some ctors are optimized away?

https://github.com/llvm/llvm-project/pull/96477