Rafael Espindola c81cf72ef3 Revert "Revert "InstCombine: Improvement to check if signed addition overflows.""
This reverts commit r209762, bringing back r209746. It was not responsible for the libc++ build failure

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209776 91177308-0d34-0410-b5e6-96231b3b80d8
2014-05-28 21:43:52 +00:00
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