[Ada] Minor tweak to line debug info

[Eric Botcazou]

This prevents the SLOC of the expression for a tag from being present in the 
line debug info every time it is referenced for coverage purposes.

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


2020-09-12  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/trans.c (gnat_to_gnu) <N_Object_Declaration>: Clear
	the SLOC of the expression of a tag.

-- 
Eric Botcazou
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