[llvm] InstSimplify: Handle nsz in fabs of known positive fold (PR #176923)

[Yingwei Zheng via llvm-commits]

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@@ -204,8 +204,30 @@ define float @square_fma_fabs_intrinsic_f32(float noundef %x) {
 
 ; The fabs cannot be eliminated because %x may be a NaN
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dtcxzyw wrote:

Looks like the comment above is outdated.

https://github.com/llvm/llvm-project/pull/176923