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

[Milin Bhade via llvm-commits]

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mbhade-amd wrote:

Moved the default store-to-load-forwarding penalty into the TTI cost layer as its own constexpr so Analysis/TargetTransformInfo.cpp no longer includes MC/MCSchedule.h — dropping the Analysis→MC dependency (NFC, value stays 10).

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