K 10
svn:author
V 8
jhibbits
K 8
svn:date
V 27
2020-01-18T02:39:38.179401Z
K 7
svn:log
V 459
Add a 'SINGLETON' directive to kobj interface definition

Summary:
This makes the interface described in the definition file act like a
pseudo-IFUNC service, by caching the found method locally.

Applying this to the PowerPC MMU definitions, it yields a significant
(15-20%) performance improvement, seen in both a 'make buildworld' and a
parallel build of LLVM, on a POWER9 system.

Reviewed By:	imp
Differential Revision:	https://reviews.freebsd.org/D23245

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