[PATCH] 3.3 Release fix on ARM - atomics

[Rafael Espíndola]

> I have asked on #gcc what gcc does. I have posted a detailed
> description in the bug, but the summary is that there is some
> cooperation with the kernel going on that should make it safe to set
> MaxAtomicInlineWidth to 64 when targeting linux armv6 or newer. Hard
> float using it then just becomes a consequence of it implying armv7.
>
> I know think we need something like the attached patch (with tests and
> comments added).

OK. The attached patch has comments and a test.

Renato, what do you think? I am currently building it on a chromebook
to make sure if fixes the bootstrap, but that will take some time.

Cheers,
Rafael
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