[llvm] [SDAG][NVPTX] Add TLI check for preferring custom FP_TO_SINT operations to FP_TO_UINT (PR #132470)

[Artem Belevich via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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Artem-B wrote:

What does this change buy us?
It appears that on this test LLVM currently generates the same output (AFAICT): https://godbolt.org/z/svM1Kns79

It's possible that I've missed something. Can you point me at the suboptimal code LLVM generates now? 
Perhaps we just need a few more test cases to cover the changes introduced by the patch..

https://github.com/llvm/llvm-project/pull/132470