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Hey folks, After a long amount of discussion both offline and on, I put a pass/intrinsic to add extended SSA up at http://reviews.llvm.org/D29316. Sean asked me to share it more broadly on llvm-dev, so here you go :) For those not familiar with extended-SSA, it's described in the paper "ABCD: Eliminating Array Bounds Checks on Demand". There is a very large amount of explanation in the summary of the review that i don't...