[Ada] introduce stack scrub (strub) feature

[Alexandre Oliva]

On Oct  5, 2021, Pierre-Marie de Rodat <derodat@adacore.com> wrote:

> 	* gcc-interface/utils.c (handle_strub_attribute): New.
> 	(gnat_internal_attribute_table): Add strub.

FTR, this is just a dummy.  The actual implementation was submitted
along with the language- and machine-independent infrastructure at
https://gcc.gnu.org/pipermail/gcc-patches/2021-September/579091.html and
it's yet to be reviewed.

-- 
Alexandre Oliva, happy hacker                https://FSFLA.org/blogs/lxo/
   Free Software Activist                       GNU Toolchain Engineer
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