FreeBSD/src 91cf497 (r340420)sys/kern subr_epoch.c

epoch(9) revert r340097 - no longer a need for multiple sections per cpu

I spoke with Samy Bahra and recent changes to CK to make ck_epoch_call and
ck_epoch_poll not modify the record have eliminated the need for this.
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+9-11sys/kern/subr_epoch.c
+9-111 files

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