* gcc-interface/gigi.h (build_atomic_load): Adjust prototype.
	(build_atomic_store): Likewise.
	(build_load_modify_store): Declare.
	(VECTOR_TYPE_P): Delete.
	* gcc-interface/decl.c (gnat_to_gnu_entity): Replace Is_Atomic with
	Is_Atomic_Or_VFA throughout.
	<E_Array_Type>: Build a variant of the XUA type instead of forcing
	TYPE_VOLATILE on it.
	<E_Array_Subtype>: Use the main variant of the base type.
	Do not force TYPE_VOLATILE on the type being built.
	<E_Record_Type>: Likewise.
	<E_Array_Subtype>: Likewise.
	<E_Subprogram_Type>: Rename local variable.
	Add Atomic qualifier in conjunction with Volatile on types if needed.
	Force BLKmode for by-ref types only at the end of the processing.
	Change qualifiers only after changing the mode of the type.  Set
	TYPE_UNIVERSAL_ALIASING_P on the type directly.
	(check_ok_for_atomic_type): Issue specific error message for VFA.
	(gnat_to_gnu_component_type): Replace Is_Atomic with
	Is_Atomic_Or_VFA throughout.
	* gcc-interface/misc.c (gnat_get_alias_set): Test
	TYPE_UNIVERSAL_ALIASING_P on the type directly.
	* gcc-interface/trans.c (lvalue_required_p): Replace Is_Atomic with
	Is_Atomic_Or_VFA throughout.  Add missing guard.
	(node_is_atomic): New predicate.
	(node_has_volatile_full_access): Likewise.
	(gnat_strip_type_conversion): New function.
	(outer_atomic_access_required_p): New predicate.
	(atomic_sync_required_p): Rename into...
	(atomic_access_required_p): ...this.  Add SYNC parameter, scan the
	parent node first and then look for the atomic setting.  Add support
	for Volatile_Full_Access.
	(Call_to_gnu): Add atomic_access and outer_atomic_access parameters
	and adjusts calls to above functions.  Use load-modify-store sequence
	for updates of In/Out and Out parameters if required, as well as for
	moving the result to the target if required.  Add couple of missing
	guards.
	(gnat_to_gnu): Adjust calls to above functions.
	<N_Object_Renaming_Declaration>: If the renamed object has side-effects
	evaluate only its address.
	<N_Assignment_Statement>: Adjust call to Call_to_gnu.  Use load-modify
	store sequence if required.
	<N_Function_Call>: Adjust call to Call_to_gnu.
	(extract_values): Adjust comment.
	* gcc-interface/utils2.c (build_atomic_load): Add SYNC parameter and
	use relaxed memory model if it is not set.
	(build_atomic_store): Likewise.
	(call_is_atomic_load): New predicate.
	(build_load_modify_store): New function.
	(build_binary_op) <MODIFY_EXPR>: Accept SAVE_EXPR on the LHS.
	(gnat_stabilize_reference) <CALL_EXPR>: Deal with atomic loads.

From-SVN: r223652