[compiler-rt] [compiler-rt][nsan] Add support for nan detection (PR #101531)

[via llvm-commits]

cseslowpoke wrote:

> Have not looked at the code yet. Regarding tests - could you please add larger tests (e.g. quadratic equation and unstable version of softmax). P.S. It'd be interesting to try it on a real-world program and see what the reports look like / check if things work as expected or not.
Sorry for taking so long to submit this. In the past few days, I wrote some tests (maybe I can add a few more) and made it so that the stack is output when NaN is detected.

https://github.com/llvm/llvm-project/pull/101531