PPC atomic.h and compare_exchange_val forms

[Ulrich Drepper]

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Steven Munroe wrote:

> I recommend dropping any mention of the 8- and 16-bit forms from
> include/atomic.h.

The definitions can be used in machine-specific files.  Therefore
they'll not be dropped.  You don't have to implement them for every
architecture, it might just mean different sources are going to be used.

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