The compiler builds renamings for actuals of formal objects for debugging
purposes in this case, but it must not generate them for temporaries.

Tested on x86_64-pc-linux-gnu, committed on trunk

gcc/ada/

	* exp_dbug.ads (Build_Subprogram_Instance_Renamings): Fix typo.
	* exp_dbug.adb (Build_Subprogram_Instance_Renamings): Build the
	renaming only for actuals of formal objects.