Matt Arsenault 832e3ffdb0 Teach computeKnownBits to look through addrspacecast.
This fixes inferring alignment through an addrspacecast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@213030 91177308-0d34-0410-b5e6-96231b3b80d8
2014-07-15 01:55:03 +00:00
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