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8ecb7e2243
r223618 including special handling of `MDNode::intersect()`: if the first operand is a self-reference with the same operands you're trying to return, return it instead. Reuse that handling in `MDNode::concatenate()` in the hopes that it fixes a polly test that seems to rely on the old behaviour [1]. [1]: http://lab.llvm.org:8011/builders/polly-amd64-linux/builds/25167 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223619 91177308-0d34-0410-b5e6-96231b3b80d8
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