[Aarch64] Enable descriptors for nested functions in Ada

[Eric Botcazou]

Similarly to x86, PowerPC and SPARC, this enables the use of custom run-time 
descriptors in Ada, thus eliminating the need for trampolines and executable 
stack in presence of pointers to nested functions.

Tested on Aarch64/Linux, OK for the mainline?


2016-11-13  Eric Botcazou  <ebotcazou@adacore.com>

	PR ada/67205
	* config/aarch64/aarch64.c (TARGET_CUSTOM_FUNCTION_DESCRIPTORS):
	Define.

-- 
Eric Botcazou
-------------- next part --------------
A non-text attachment was scrubbed...
Name: p.diff
Type: text/x-patch
Size: 585 bytes
Desc: not available
URL: <http://gcc.gnu.org/pipermail/gcc-patches/attachments/20161113/fed05ea1/attachment.bin>