Chris Lattner f9944f109c Do not let MaskedValueIsZero consider undef to be zero, for reasons
explained in the comment.

This fixes UnitTests/2003-09-18-BitFieldTest on darwin


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22483 91177308-0d34-0410-b5e6-96231b3b80d8
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