[llvm] [ValueTracking] Fix incorrect inferrence about the signbit of sqrt (PR #92510)

[via llvm-commits]

llvmbot wrote:

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Failed to cherry-pick: 04ae6e600a3090ccc1f80d0110a1108aa73a54f8

https://github.com/llvm/llvm-project/actions/runs/9159786286

Please manually backport the fix and push it to your github fork.  Once this is done, please create a [pull request](https://github.com/llvm/llvm-project/compare)

https://github.com/llvm/llvm-project/pull/92510