[VPlan] Add transformation to narrow interleave groups. 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. For now it only transforms load interleave groups feeding store groups. Depends on #106431. This lands the main parts of the approved https://github.com/llvm/llvm-project/pull/106441 as suggested to break things up a bit more.
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