[llvm] [SLP] Bail out on store-to-load forwarding hazards (PR #199606)

[via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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mbhade-amd wrote:

Pre-commit of the test in #199908. Once that lands I'll rebase this PR.

https://github.com/llvm/llvm-project/pull/199606