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02050986d9
to add/sub by doing the normal operation and then checking for overflow afterwards. This generally relies on the DAG handling the later invalid operations as well. Fixes the 64-bit part of rdar://8622122 and rdar://8774702. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123908 91177308-0d34-0410-b5e6-96231b3b80d8