[PATCH] D84962: [PowerPC] Correct cpsgn's behaviour on PowerPC to match that of the ABI

[Nemanja Ivanovic via Phabricator via cfe-commits]

nemanjai requested changes to this revision.
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This is not what we want. The builtin behaves correctly. It is equivalent to the generic `__builtin_copysign` and it would be very surprising to a user if it reverses the operands depending on which version you use. What is implemented incorrectly is `vec_cpsgn` so that's what should change.


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https://reviews.llvm.org/D84962