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This patch adds a new narrowInterleaveGroups transfrom, which tries convert a plan with interleave groups with VF elements to a plan that instead replaces the interleave groups with wide loads and stores processing VF elements. This effectively is a very simple form of loop-aware SLP, where we use interleave groups to identify candidates. This initial version is quite restricted and hopefully serves as a starting point for how to best model those kinds of transforms. Depends on https://github.com/llvm/llvm-project/pull/106431. Fixes https://github.com/llvm/llvm-project/issues/82936. PR: https://github.com/llvm/llvm-project/pull/106441