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Commit 0157e7f5 authored by Chris Lattner's avatar Chris Lattner
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Port the recent innovations in ComputeMaskedBits to SimplifyDemandedBits. 

This allows us to simplify on conditions where bits are not known, but they
are not demanded either!  This also fixes a couple of bugs in
ComputeMaskedBits that were exposed during this work.

In the future, swaths of instcombine should be removed, as this code
subsumes a bunch of ad-hockery.

llvm-svn: 26122
parent b24ce3a2
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