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is actually being tested. Also add some FileCheck goodness to much more carefully ensure that the result is the desired result. Before this test would only have failed through an assert failure if the underlying fix were reverted. Also, add some weight metadata and a comment explaining exactly what is going on to a trick section of the test case. Originally, we were getting very unlucky and trying to form a block chain that isn't actually profitable. I'm working on a fix to avoid forming these unprofitable chains, and that would also have masked any failure from this test case. The easy solution is to add some metadata that makes it *really* profitable to form the bad chain here. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@145006 91177308-0d34-0410-b5e6-96231b3b80d8
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