[C11-atomic] Miscellaneous fixes 1/n

[Joseph S. Myers]

On Fri, 18 Oct 2013, Andrew MacLeod wrote:

> I had thought about making the type and value of atomic_flag hooks , but never
> got to it.  There is currently one for the TRUE value which is exposed to the
> C++ templates as" __GCC_ATOMIC_TEST_AND_SET_TRUEVAL"

I'm tending to think of this, and alignment for cris, as things that don't 
need to be done before the work is mainline-ready - if the basic support 
is in, architecture maintainers can add whatever hooks they need for their 
architectures later, not just in development stage 1.

-- 
Joseph S. Myers
joseph@codesourcery.com