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[NFC] [PowerPC] Add isPredicable for basic instrs

Authored by qiucf on Jan 10 2020, 12:43 AM.

Description

[NFC] [PowerPC] Add isPredicable for basic instrs

PowerPC uses a dedicated method to check if the machine instr is
predicable by opcode. However, there's a bit isPredicable in instr
definition. This patch removes the method and set the bit only to
opcodes referenced in it.

Differential Revision: https://reviews.llvm.org/D71921