[llvm] [IR] Set Number of Hungoff Uses after allocation (PR #213304)

[Reid Kleckner via llvm-commits]

https://github.com/rnk approved this pull request.

lgtm

Just be aware that LLVM in general isn't exception safe, see: https://llvm.org/docs/CodingStandards.html#do-not-use-rtti-or-exceptions

This PR is just a mitigation, and in general, it isn't safe to recover and continue after an exception is thrown through LLVM stack frames. A client should expect memory leaks, and try to exit cleanly as soon as possible to restart in a fresh address space.

https://github.com/llvm/llvm-project/pull/213304