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[PowerPC] Add options to control paired vector memops support

Authored by bsaleil on Jul 28 2020, 2:02 PM.

Description

[PowerPC] Add options to control paired vector memops support

Adds frontend and backend options to enable and disable the
PowerPC paired vector memory operations added in ISA 3.1.
Instructions using these options will be added in subsequent patches.

Differential Revision: https://reviews.llvm.org/D83722

Details