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[PowerPC] Prevent the use of MMA with P9 and earlier

Authored by bsaleil on Nov 12 2020, 8:32 AM.

Description

[PowerPC] Prevent the use of MMA with P9 and earlier

We want to allow using MMA on P10 CPU only. This patch prevents the use of MMA
with the -mmma option on P9 CPUs and earlier.

Differential Revision: https://reviews.llvm.org/D91200

Details