[PATCH] gcc: implement AIX-style constructors

[CHIGOT, CLEMENT]

Hi David,

Here is the new version of the patch.
I've moved the startup function in crtcdtors files.

I'm just wondering if the part dealing with the
__init_aix_libgcc_cxa_atexit is needed. I'm adding it because
the destructor created in crtcxa.o is following GCC format and
thus won't be launched if the flag "-mcdtors=aix" is passed.
However, as you said, this option might not operate correctly
if the GCC runtime isn't rebuild with it.

Thanks,
Clément
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