[Ada] Fix issues with ignored ghost code and unnesting

[Pierre-Marie de Rodat]

Unnesting needs to be run after all ignored ghost code is removed
so that it doesn't try to put entities into activation records that will
be removed. Also, don't add subprograms that are ignored into the list
of inlined subprograms.

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

gcc/ada/

	* frontend.adb (Frontend): Do unnesting after ignored ghost code
	has been removed.
	* inline.adb (Analyze_Inlined_Bodies): Don't put ignored ghost
	entities on inlined subprogram list.
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