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It seems that at some point in the not-so-distant-past that the loop vectorizer gained the ability to vectorize loops without explicit `llvm.loop` & `llvm.mem.parallel_loop_access` metadata. While that's awesome, there seems to be a regression in that `llvm.mem.parallel_loop_access` metadata doesn't make it into the alias analysis, and therefore a `vector.memcheck` basic block is

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