David Majnemer 77e22b7836 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225126 91177308-0d34-0410-b5e6-96231b3b80d8

2015-01-04 07:06:53 +00:00

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