Chris Lattner 54c0359890 do not try to analyze bitcasts from i64 to <2 x i32> in ComputedMaskedBits. While
we could do this, doing so requires adjusting the demanded mask and the code isn't 
doing that yet.  This fixes PR4495

llvm-svn: 74699
2009-07-02 16:04:08 +00:00
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