Use a variable before it's declaration

[Valdis.Kletnieks at vt.edu]

On Thu, 10 Sep 2015 15:09:42 +0800, Rock Lee said:

> union thread_union init_thread_union __init_task_data =
>
>      { INIT_THREAD_INFO(init_task) };

'gcc -E' to see what this expands to.  All may not be as it seems. :)
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