[llvm] [LV] Support tail-folded epilogue loops (PR #208764)

[David Sherwood via llvm-commits]

================
@@ -880,6 +878,8 @@ class LoopVectorizationPlanner {
 
   /// The interleaved access analysis.
   InterleavedAccessInfo &IAI;
+  /// The interleaved access analysis for the case of tail-folded epilogue.
+  std::unique_ptr<InterleavedAccessInfo> EpilogueTfIAI;
 
----------------
david-arm wrote:

Can that be done in a NFC patch before this one then? That way you can rebase on top and then we won't need this new `EpilogueTfIAI` variable? I'd prefer it if we didn't have to add a tail-folded epilogue specific variable here.

https://github.com/llvm/llvm-project/pull/208764