[llvm] [SLPVectorizer] Use accurate cost for external users of resize shuffles (PR #137419)

[Alexey Bataev 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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alexey-bataev wrote:

The test should be precommitted in a separate NFC patch

https://github.com/llvm/llvm-project/pull/137419