[PATCH] D119679: [SLP] Prohibit vectorization of externally used intermediate insertelements

[Anton Afanasyev via Phabricator via llvm-commits]

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Break vectorization of insertelements where some of intermediate
(i.e. not last) insertelements are used externally. We do this
at `buildTree()` stage.

Fixes PR52275
Fixes #51617


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D119679

Files:
  llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
  llvm/test/Transforms/SLPVectorizer/X86/pr52275.ll

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