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[PowerPC] Enable MachinePipeliner for P9 with -ppc-enable-pipeliner

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[PowerPC] Enable MachinePipeliner for P9 with -ppc-enable-pipeliner

Implement necessary target hooks to enable MachinePipeliner for P9 only.
The pass is off by default, can be enabled with -ppc-enable-pipeliner for P9.

Differential Revision: https://reviews.llvm.org/D62164

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