[llvm] [SCEV] Cache collected loop guards. NFCI (PR #116947)

[Nikita Popov via llvm-commits]

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@@ -1167,6 +1207,7 @@ class ScalarEvolution {
   /// If \p AllowPredicates is set, this call will try to use a minimal set of
   /// SCEV predicates in order to return an exact answer.
   ExitLimit computeExitLimitFromCond(const Loop *L, Value *ExitCond,
+                                     std::function<LoopGuards()> GetLoopGuards,
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nikic wrote:

std::function -> function_ref

https://github.com/llvm/llvm-project/pull/116947