[llvm] [SLP] Support ordered FAdd reductions in SLPVectorizer (PR #146570)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
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sc-clulzze wrote:

I can create another PR with precommit test but I will be unable to merge it

https://github.com/llvm/llvm-project/pull/146570