[patch] Fix PR middle-end/65958

[Eric Botcazou]

> Looks good to me.  I also found the Arrays of Variable Length section
> in extend.texi which also refers to alloca as doing the same.  We may
> want to add a note there that you should not mix both and that only
> VLAs (when not mixed with alloca) are freed at scope boundary.

It's already there and in fact the current behavior is documented:

 There are other differences between these two methods.  Space allocated
with `alloca' exists until the containing _function_ returns.  The
space for a variable-length array is deallocated as soon as the array
name's scope ends.  (If you use both variable-length arrays and
`alloca' in the same function, deallocation of a variable-length array
also deallocates anything more recently allocated with `alloca'.)

so we need to amend the documentation if we go for the patch.

-- 
Eric Botcazou