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[PowerPC] Add accumulator register class and instructions

Authored by bsaleil on Sep 25 2020, 9:30 AM.

Description

[PowerPC] Add accumulator register class and instructions

This patch adds the xxmfacc, xxmtacc and xxsetaccz instructions to manipulate
accumulator registers. It also adds the ACC register class definition for the
accumulator registers.

Differential Revision: https://reviews.llvm.org/D84847