4.6 Barrier Patch for Review

[Joel Sherrill]

Round 2 attached.  How does this one look?

--joel
Till Straumann wrote:

> I agree with Eric, Thomas and Pavel.
>
> The barriers must prevent stuff from
> being moved out of the protected section:
>
>    protection enable (isr_disable or thread_dispatch_disable++)
>    barrier
>       protected code
>    barrier
>    protection disable (isr_enable or thread_enable_dispatch)
>
> -- Till
>

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