[llvm] Handle VECREDUCE intrinsics in NVPTX backend (PR #136253)

[Alex MacLean via llvm-commits]

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

Please break this PR into 2 commits, one which pre-commits the tests and a second which contains your changes and updates your tests.

https://github.com/llvm/llvm-project/pull/136253