Fix profile/tick probe args when the probe fires from an idle thread
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Authored by markj on May 8 2017, 10:56 PM.

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rS318319: Ensure that profile and tick probes provide a non-zero PC value.

Summary

If we don't have an interrupt frame and the running thread is an idle
thread, pass the address of cpu_idle() for arg0. This ensures that one
of the probe arguments is non-zero. At least one of the profile
provider tests expects this, and &cpu_idle seems like a reasonable
representative value for this case.