[PATCH] D130418: [LoopDataPrefetch] Fix crash when TTI doesn't set CacheLineSize

[Allen zhong via Phabricator via llvm-commits]

Allen added a comment.

In D130418#3675649 <https://reviews.llvm.org/D130418#3675649>, @tschuett wrote:

> Do you force all targets to provide `PrefetchDistance` and `PrefetchDistance` or could it be an `llvm::optional` ?

Thanks, I think it is unfriendly to crash at the moment. Use a default value when they are not specified can be independent next step, if you feel the need.


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