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

Authored by Conanap on Nov 5 2020, 11:55 AM.

Description

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

This patch fixes the reversed behaviour exhibited by cpsgn on PPC. It now matches the ABI.

Differential Revision: https://reviews.llvm.org/D84962

Details