e2a72fa583
Introduce new subclasses of VPWidenMemoryRecipe for VP (vector-predicated) loads and stores to address multiple TODOs from https://github.com/llvm/llvm-project/pull/76172 Note that the introduction of the new recipes also improves code-gen for VP gather/scatters by removing the redundant header mask. With the new approach, it is not sufficient to look at users of the widened canonical IV to find all uses of the header mask. In some cases, a widened IV is used instead of separately widening the canonical IV. To handle that, first collect all VPValues representing header masks (by looking at users of both the canonical IV and widened inductions that are canonical) and then checking all users (recursively) of those header masks. Depends on https://github.com/llvm/llvm-project/pull/87411. PR: https://github.com/llvm/llvm-project/pull/87816
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