libstdc++: Attempt to resolve PR83562

[Jonathan Yong]

On 10/27/20 2:38 PM, Liu Hao via Gcc-patches wrote:
> 在 2020/10/8 22:56, Jason Merrill 写道:
>>
>> Hmm, why isn't the mingw implementation used for all programs?  That would avoid the bug.
>>
> 
> There was a little further discussion about this [1].
> 
> TL;DR: The mingw-w64 function is linked statically and subject to issues about order of destruction.
> 
> Recently mingw-w64 has got its own `__cxa_thread_atexit()` so libstdc++ no longer exposes it. This patch for libstdc++ fixes
> calling conventions for destructors on i686 so they match mingw-w64 ones.
> 

Any more comments? I'd like to push this soon if there are no more 
issues open.

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