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Commit d369d4bd authored by Nadav Rotem's avatar Nadav Rotem
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Optimize concat_vectors(X, undef) -> scalar_to_vector(X).

This optimization is not SSE specific so I am moving it to DAGco.
The new scalar_to_vector dag node exposed a missing pattern in the AArch64 target that I needed to add.

llvm-svn: 193393
parent 7633afc9
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