C++ PATCHes for abi_tag bugs

[Jason Merrill]

On 01/31/2016 06:49 AM, Jason Merrill wrote:
> These patches fix a couple of abi_tag bugs that were reported to me
> recently.
>
...
>
> The second is an issue where the multiple-initialization guard for a
> tagged variable was not itself tagged.

That didn't completely fix the issue.  Trying again:

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