Pull up following revision(s) (requested by rin in ticket #1171):

sys/arch/aarch64/aarch64/pmap.c: revision 1.82
sys/arch/aarch64/aarch64/pmap.c: revision 1.83

pmap_procwr(): sync icache even if p != curproc. This fixes applications
like GDB for arm32, that rewrite text of other process.

Thanks to ryo@ for discussion.

Use tlen for temporary length variable instead of l, which is usually
used for struct lwp *.
No binary changes.

(martin)