Add stacked vdso and interval timer support#3

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grantae wants to merge 10 commits intostanford-mast:masterfrom grantae:itimer_api

+1,201-56

Commits on Sep 12, 2016

[virt] Add an interval timer API that hooks into the scheduler.
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Commits on Sep 15, 2016

[virt] Add syscall virtualization hooks for set/getitimer and alarm.
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Commits on Sep 26, 2016

[vdso] Add support for stacked vdso information.
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Commits on May 11, 2017

Use the zero-based process ID instead of the OS PID to index the process tree nodes.
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Commits on Jul 5, 2017

[virt] Move interval_timer.{h,cpp} to virt/.
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Commits on Jul 7, 2017

Commits on Jul 15, 2017