K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2017-06-09T20:26:42.394637Z
K 7
svn:log
V 337
Follow up r313841 on powerpc

Close a potential race in reading the CPU dtrace flags, where a thread can
start on one CPU, and partway through retrieving the flags be swapped out,
while another thread traps and sets the CPU_DTRACE_NOFAULT.  This could
cause the first thread to return without handling the fault.

Discussed with:	markj@

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