clang-format: Allow unbroken ::: in inline assembly

[Daniel Jasper]

I think the change itself look good (although I don't use inline assembly
much). Please add a test.

On Mon, Sep 15, 2014 at 11:14 PM, Eugene Toder <eltoder at gmail.com> wrote:

> Hello,
>
> When inline assembly has only clobber constraints it's common to write all
> three colons without spaces, for example:
>
> asm volatile("nop" ::: "memory");
>
> Currently clang-format splits ::: into coloncolon and colon, and inserts a
> space before the colon, which looks strange:
>
> asm volatile("nop" :: : "memory");
>
> I suggest to allow having ::: without spaces in this case. Attached is a
> simple patch to that effect.
>
> Thanks,
> Eugene
>
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