[Ada] Use encoded names only with -fgnat-encodings=all

[Pierre-Marie de Rodat]

This disables the last special encoding done in Get_Encoded_Name, except
when -fgnat-encodings=all is passed on the command line.

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

gcc/ada/

	* exp_dbug.adb (Get_Encoded_Name): Do not encode names of discrete
	types with custom bounds, except with -fgnat-encodings=all.
	* exp_pakd.adb (Create_Packed_Array_Impl_Type): Adjust comment.
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