[llvm] LSV: document hang reported in #37865 (PR #102479)

[Björn Pettersson via llvm-commits]

bjope wrote:

Hi @artagnon,

Downstream we have the fix from https://reviews.llvm.org/D54468, but it seems it never landed upstream.
The new test case you added here fails for us, since we do not trigger the new assert.

When looking at the review comments in https://reviews.llvm.org/D54468 it seems like there were some doubts about the validity of that patch. Nevertheless, we've used that fix downstream for nearly 6 years now.

https://github.com/llvm/llvm-project/pull/102479