PC-BSD/trueos c835431sys/amd64/include counter.h

counter(9): unbreak amd64 following r336020

Apply temporary fix to counter until daylight hours.
The fact that the assembly for counter_u64_add relied on the sizeof(struct pcpu) was
the basis for the otherwise arbitrary offset never came up in D15933.
critical_{enter,exit} is now inline so the only real added overhead is the
added (mostly false) conditional branch in exit.
DeltaFile
+8-1sys/amd64/include/counter.h
+8-11 files

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