[llvm] [LV] Add initial support for vectorizing literal struct return values (PR #109833)

[Florian Hahn via llvm-commits]

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+; RUN: opt < %s -passes=loop-vectorize,dce,instcombine -force-vector-interleave=1 -S | FileCheck %s --check-prefixes=NEON
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fhahn wrote:

The target independent tests don't have to necessarily use scalable vectors, it would be sufficient to cover the various code paths for fixed vectors. And then have some scalable codegen & AArch64 cost modeling tests in `AArch64/`

https://github.com/llvm/llvm-project/pull/109833