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Summary: The BUILD_VECTOR node will truncate its operators to match the type. We need to take this into account when constant folding - we need to perform a truncation before constant folding the elements. This is because the upper bits can change the result, depending on the operation type (for example this is the case for min/max). This change also adds a regression test. Reviewers: jmolloy Subscribers: jmolloy, llvm-commits Differential Revision: http://reviews.llvm.org/D12697 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@247265 91177308-0d34-0410-b5e6-96231b3b80d8
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