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[x86] add test for WriteZero sched class instructions; NFC

Description

[x86] add test for WriteZero sched class instructions; NFC

Nops should have zero latency because there is no result.
Idioms like 'xorps xmm0, xmm0' may have zero latency because
they are handled without using an execution unit.

Details

Committed
spatelMar 13 2018, 12:20 PM
Parents
rL327434: Serialize the NonTrivialToPrimitive* flags I added in r326307.
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