[PATCH] D106679: [WIP][X86] Move shl(x, 1) -> add(x, x) vector fold to ISEL (PR50468)

[Simon Pilgrim via Phabricator via llvm-commits]

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Abandoning this - I'm going to go with the FREEZE approach (D106675 <https://reviews.llvm.org/D106675>) once the necessary support has been added to DAG (D130646 <https://reviews.llvm.org/D130646> etc.).


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https://reviews.llvm.org/D106679