[Ada] Remove obsolete code in UI_From_gnu

[Eric Botcazou]

Now that HOST_BITS_PER_WIDE_INT is always 64, we can get rid of disabled code 
in the UI_From_gnu routine.

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


2018-11-19  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/cuintp.c (UI_From_gnu): Remove code for 32-bit hosts.

-- 
Eric Botcazou
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