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

[Alexander Shaposhnikov via llvm-commits]

alexander-shaposhnikov wrote:

I've looked at the tests for `msan`, there are a few that use SSE, I'd add a small test along those lines. Adding a larger test
(e.g. Gaussian elimination) is more than welcome too. 
Thanks for your patience.

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