[IA] Remove recursive [de]interleaving support (#143875) Now that the loop vectorizer emits just a single llvm.vector.[de]interleaveN intrinsic after #141865, we can remove the need to recognise recursively [de]interleaved intrinsics. No in-tree target currently has instructions to emit an interleaved access with a factor > 8, and I'm not aware of any other passes that will emit recursive interleave patterns, so this code is effectively dead. Some tests have been converted from the recursive form to a single intrinsic, and some others were deleted that are no longer needed, e.g. to do with the recursive tree. This closes off the work started in #139893.
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