Fix syscall changes lost in rebase
Fix syscall changes lost in rebase

These syscalls were changed in the amd64 file around the time the arm64 PR was
sent out, so their changes got lost.

Updates #63

PiperOrigin-RevId: 275114194

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor