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Author SHA1 Message Date
David Majnemer
8ed72d8999 ValueTracking: ComputeNumSignBits should tolerate misshapen phi nodes 
PHI nodes can have zero operands in the middle of a transform.  It is
expected that utilities in Analysis don't freak out when this happens.

Note that it is considered invalid to allow these misshapen phi nodes to
make it to another pass.

This fixes PR22086.

llvm-svn: 225126
 2015-01-04 07:06:53 +00:00