ada: Avoid Ignored ghost code behavior in Codepeer_Mode

ada: Avoid Ignored ghost code behavior in Codepeer_Mode

When the frontend is called by it should treat all ghost
code as checked. Avoid removing expansion in ignored ghost code regions
when Codepeer_Mode is active.

gcc/ada/ChangeLog:

	* sem_ch6.adb (Analyze_Subprogram_Body_Helper): Avoid disabling
	the expander for ignored ghost regions if Codepeer_Mode is active.
	* sem_ch7.adb (Analyze_Package_Body_Helper): Likewise.
	* freeze.adb (Freeze_Entity): Avoid triggering special freezing
	action for entities within ignored ghost regions in Codepeer_Mode.