[Ada] Avoid use of secondary stack

[Eric Botcazou]

> This patch avoids the use of the secondary stack, and the corresponding
> cleanup handlers, in many cases. For example, access discriminants no
> longer force functions to return on the secondary stack. This is a speed
> improvement. It is particularly relevant to the Ada.Containers.

It also uncovered a buglet in gigi, fixed thusly, applied on the mainline.


2015-05-28  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Subprogram_Type>: Do
	not error out on a return type which has a size that overflows if the
	return is done by invisible reference.


-- 
Eric Botcazou
-------------- next part --------------
A non-text attachment was scrubbed...
Name: p.diff
Type: text/x-patch
Size: 688 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20150528/6cc04ef7/attachment.bin>