process: add O_NOATIME constant
Checklist
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tests and code linting passes -
a test and/or benchmark is included -
the commit message follows commit guidelines
Affected core subsystem(s)
process src test
Description of change
Add O_NOATIME fs flag on Linux.
WIP. Do not land (yet). (Running the test first everywhere to make sure results are as expected on all the Linux hosts.)