[PATCH] Define/use X_ALIGN2() instead of open coding it

[Mikhail Gusarov]

Twas brillig at 18:14:31 19.06.2010 UTC-04 when mattst88 at gmail.com did gyre and gimble:

 MT> Signed-off-by: Matt Turner <mattst88 at gmail.com>

From the discussion in IRC:

- X_ALIGN2 is not clear enough. pad_to_pow_two?
- It's not macro, so no need to have it all caps.
- misc.h brings too much garbage, better have include/align.h,
- So _HAVE_XALLOC_DECLS won't be needed.

-- 
  http://fossarchy.blogspot.com/
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