[llvm] [LoopDataPrefetch] Enable handling of target-specific memory intrinsics (PR #207358)

[Matt Arsenault via llvm-commits]

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@@ -40,6 +40,10 @@ static cl::opt<bool>
 PrefetchWrites("loop-prefetch-writes", cl::Hidden, cl::init(false),
                cl::desc("Prefetch write addresses"));
 
+static cl::opt<bool> PrefetchTgtMemIntrinsics(
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arsenm wrote:

Don't add this 

https://github.com/llvm/llvm-project/pull/207358