[PATCH] stack usage of pmap_activate in cpu_switch()

[Jayachandran C.]

In the cpu_switch code, pmap_activate is called with the stack of the
old thread even after the thread was switched out. This seems to be
the cause of a crash I see here (on XLP) under stress.

Seems like a bug to me, any thoughts?

The attached patch restores the SP from the new thread from its PCB
before calling pmap_activate().

JC.
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