[libc] [llvm] [libc][math] Fix signaling nan handling of hypot(f) and improve hypotf performance. (PR #99432)

[via llvm-commits]

lntue wrote:

> Oh, these includes in libc/test/src/math/smoke/HypotTest.h should probably be removed:
> 
> * "src/__support/FPUtil/FPBits.h"
> * "test/UnitTest/FEnvSafeTest.h"
> * "hdr/math_macros.h"

Done.

https://github.com/llvm/llvm-project/pull/99432