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We had previously been asserting when faced with a FCOPYSIGN f64, ppcf128 node because there was no way to expand the FCOPYSIGN node. Because ppcf128 is the sum of two doubles, and the first double must have the larger magnitude, we can take the sign from the first double. As a result, in addition to fixing the crash, this is also an optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188655 91177308-0d34-0410-b5e6-96231b3b80d8
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