[Ada] Tidy up gnat_pushdecl

[Eric Botcazou]

And more precisely the block of code at the end responsible for setting the 
name of types and creating associated typedefs if necessary.

Tested on x86_64-suse-linux, applied on the mainline.


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

	* gcc-interface/utils.c (gnat_pushdecl): Reunify the handling of array
	and pointer types wrt DECL_ORIGINAL_TYPE and adjust left and right.


-- 
Eric Botcazou
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