[PATCH] D37896: [DAGCombine] Resolving PR34474 by transforming mul(x, 2^c +/- 1) -> sub/add(shl(x, c) x) for any type including vector types

[Simon Pilgrim via Phabricator via llvm-commits]

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This can be abandoned - we have decomposeMulByConstant to handle this already


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