take 2: request for review: backport of sx and rwlocks from 7.0 to 6-stable

[Alfred Perlstein]

Updated patch attached:

sizeof(struct sx) should be the same.
garbage removed from kern_sx.c.
alignment of "struct thread" set to constant rather than magic number.
uma_zalloc of "struct thread" fixed to use constant.



-- 
- Alfred Perlstein
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