back-end.adb (Call_Back_End): Pass Standard_Character to gigi.

	* back-end.adb (Call_Back_End): Pass Standard_Character to gigi.
	* gcc-interface/gigi.h (gigi): Add standard_character parameter.
	(CHAR_TYPE_SIZE, SHORT_TYPE_SIZE, INT_TYPE_SIZE, LONG_TYPE_SIZE, 
	LONG_LONG_TYPE_SIZE, FLOAT_TYPE_SIZE, DOUBLE_TYPE_SIZE,
	LONG_DOUBLE_TYPE_SIZE, SIZE_TYPE): Delete.
	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Array_Subtype>: Call
	rm_size.
	* gcc-interface/misc.c (gnat_init): Set signedness of char as per
	flag_signed_char.  Tag sizetype with "size_type" moniker.
	* gcc-interface/trans.c (gigi): Add standard_character parameter.
	Remove useless built-in types.  Equate unsigned_char_type_node to
	Standard.Character.  Use it instead of char_type_node throughout.
	(Attribute_to_gnu): Likewise.
	(gnat_to_gnu): Likewise.
	* gcc-interface/utils2.c (build_call_raise): Likewise.

From-SVN: r158462