Break infinite loop when the Hopfield network oscillates.

This is impossible in theory, I can prove it. In practice, our near-zero
threshold can cause the network to oscillate between equally good
solutions.

<rdar://problem/9720596>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134428 91177308-0d34-0410-b5e6-96231b3b80d8
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