Performance improvement with 58a2e3f5c37be02dac3086b81bdda9414b931edf

[Lukáš Doktor]

Hello Stefan, folks,

the perf-ci detected and bisected the 58a2e3f5c37 - block: compile out 
assert_bdrv_graph_readable() by default - as a performance improvement 
especially with 4K reads with multiple jobs (but minor improvements were 
observed in other variants)

    https://ldoktor.github.io/tmp/RedHat-virtlab722/v8.0.0/140-improvement.html

Based on the commit message I guess it's expected so take this just as a record 
of improvement.

Regards,
Lukáš

PS: The list of perf-ci issues is available here: 
https://docs.google.com/spreadsheets/d/1HEXI5wDsNgAIgXl5MIhGond898Vz5A1Hrkl0lZmWEbg/edit#gid=0

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