contracts.adb (Analyze_Object_Contract): Set and restore the SPARK_Mode for both constants and objects.

2015-10-26  Hristian Kirtchev  <kirtchev@adacore.com>

	* contracts.adb (Analyze_Object_Contract): Set and restore
	the SPARK_Mode for both constants and objects. Factor out the
	semantic checks concerning Ghost objects.
	* freeze.adb (Freeze_Array_Type): A Ghost array type cannot have a
	concurrent component type.
	(Freeze_Entity): A Ghost type cannot also be concurrent.
	(Freeze_Record_Type): A Ghost record type cannot have a concurrent
	component.
	* sem_prag.adb (Analyze_Abstract_State): A Ghost abstract
	state cannot also be synchronized.
	(Check_Ghost_Synchronous): New routine.
	* sem_util.adb (Yields_Synchronized_Object): Correct the case
	of record components to account for the case where the type has
	no component list.

2015-10-26  Hristian Kirtchev  <kirtchev@adacore.com>

	* expander.adb (Expand): Expand a single protected declaration.
	* exp_ch9.ads, exp_ch9.adb (Expand_N_Single_Protected_Declaration): New
	routine.

2015-10-26  Hristian Kirtchev  <kirtchev@adacore.com>

	* sem_res.adb (Is_OK_Volatile_Context): A volatile object may appear
	in an object declaration as long as it denotes the name.

From-SVN: r229376