[Patch, C, C++] Accept GCC ivdep for 'do' and 'while', and for C++11's range-based loops

[Tobias Burnus]

Tobias Burnus wrote:
> Jason Merrill wrote:
>> I would think that a range-based loop over an array should vectorize
>> nicely:
> [...]
> Therefore, I will send a follow up patch.

Attached is that patch [C++].

[C/C++:] Additionally, as Jakub proposed and other compilers also 
support,  the patch accepts #pragma GCC ivdep for 'do' and 'while' loops.

I did an successful all-language bootstrap followed by successful 
regstesting on x86-64-gnu-linux.
OK for committal?

Tobias
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