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Separate the handling of AND/AND8 out from PHI/OR/ISEL checking. The reasoning
is the others need all their operands to be sign/zero extended for their output
to also be sign/zero extended. This is true for AND and sign-extension, but for
zero-extension we only need at least one of the input operands to be zero
extended for the result to also be zero extended.
Differential Revision: https://reviews.llvm.org/D39078
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319289 91177308-0d34-0410-b5e6-96231b3b80d8
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