[TEST/REVIEW/PERF] kern_thread.c tid allocation patch

[David Xu]

Poul-Henning Kamp wrote:

>In message <423A1AD4.2050207 at freebsd.org>, David Xu writes:
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>>I have tested it, yes, it is slight faster than current code.
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>Cool!
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>Are there any tests we need to run it through before I commit it ?
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Be sure to not generate duplicated tid, otherwise 1:1 threading library 
and debugging code
will mystically fail. :)