Chris Lattner 44ceb8a341 generalize this code so that fast isel handles integer truncates to i1, which
codegen to the same thing as integer truncates to i8 (the top bits are 
just undefined).  This implements rdar://6667338


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66902 91177308-0d34-0410-b5e6-96231b3b80d8
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