FreeBSD/src 9d45af5 (r352434)sys/mips/include pcpu.h, sys/mips/mips pmap.c

mips: move support for temporary mappings above KSEG0 to per-CPU data

This is derived from similar work done in r310481 for i386 and r312610 for
armv6/armv7. Additionally, use a critical section to keep the thread
pinned for per-CPU operations instead of completely disabling local interrupts.

No objections from:     adrian, jmallett, imp
Differential Revision:  https://reviews.freebsd.org/D18593
DeltaFile
+84-119sys/mips/mips/pmap.c
+7-1sys/mips/include/pcpu.h
+91-1202 files

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