[Ada] Fix incorrect SLOC on instruction

[Eric Botcazou]

This puts the missing SLOC on a statement generated by a return.

Tested on x86-64/Linux, applied on the mainline, 11 and 10 branches.


2021-05-21  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/trans.c (gnat_to_gnu) <N_Simple_Return_Statement>:
	Put a SLOC on the assignment from the return value to the return
	object in the copy-in/copy-out case.

-- 
Eric Botcazou
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