Stanislav Mekhanoshin c2ad7ee1a9 [AMDGPU] override isHighLatencyDef ...

SIMachineScheduler uses isHighLatencyInstruction with the same
sematincs, but TargetInstrInfo has virtual isHighLatencyDef
method, so override it instead.

Added FLAT to the list of high latency opcodes and a check for
mayLoad since stores are not technically high latency in terms
of data dependency.

This change did not produce any visible impact on our tests.

Differential Revision: https://reviews.llvm.org/D73582

2020-01-29 08:01:29 -08:00

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