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MachineSink: make shouldSink a TII target hook

Description

MachineSink: make shouldSink a TII target hook

Some targets may disagree on what they want sunk or not sunk,
so make this a target hook instead of hardcoded.

Details

Committed
eschaMar 29 2016, 3:44 PM
Parents
rL264798: [LoopDataPrefetch] Make more member functions private, NFC.
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