[Ada] Small tweak to gnat_to_gnu_param

[Eric Botcazou]

We mark the type of In parameters in Ada with the const qualifier, but it is 
stripped by free_lang_data_in_type so do not do it in LTO mode.

Tested on x86-64/Linux, applied on the mainline.


2020-05-08  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/decl.c (gnat_to_gnu_param): Do not make a variant of
	the type in LTO mode.

-- 
Eric Botcazou
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