Rafael Espindola ba0a6cabb8 Always compute all the bits in ComputeMaskedBits.
This allows us to keep passing reduced masks to SimplifyDemandedBits, but
know about all the bits if SimplifyDemandedBits fails. This allows instcombine
to simplify cases like the one in the included testcase.

llvm-svn: 154011
2012-04-04 12:51:34 +00:00
..
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Low Level Virtual Machine (LLVM)
================================

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