* ttypes.ads (Target_Double_Float_Alignment): New variable.
	(Target_Double_Scalar_Alignment): Likewise.
	* get_targ.ads (Get_Strict_Alignment): Adjust external name.
	(Get_Double_Float_Alignment): New imported function.
	(Get_Double_Scalar_Alignment): Likewise.
	* layout.adb (Set_Elem_Alignment): Take into account specific caps for
	the alignment of "double" floating-point types and "double" or larger
	scalar types, as parameterized by Target_Double_Float_Alignment and
	Target_Double_Scalar_Alignment respectively.
	* gcc-interface/gigi.h (double_float_alignment): Declare.
	(double_scalar_alignment): Likewise.
	(is_double_float_or_array): Likewise.
	(is_double_scalar_or_array): Likewise.
	(get_target_double_float_alignment): Likewise.
	(get_target_double_scalar_alignment): Likewise.
	* gcc-interface/targtyps.c (get_strict_alignment): Rename into...
	(get_target_strict_alignment): ...this.
	(get_target_double_float_alignment): New function.
	(get_target_double_scalar_alignment): Likewise.
	* gcc-interface/decl.c (gnat_to_gnu_entity) <E_Signed_Integer_Subtype>:
	Test the presence of an alignment clause for under-aligned integer
	types.  Take into account specific caps for the alignment of "double"
	floating-point types and "double" or larger scalar types, as
	parameterized by Target_Double_Float_Alignment and
	Target_Double_Scalar_Alignment respectively.
	(validate_alignment): Likewise.
	* gcc-interface/trans.c (Attribute_to_gnu) <Attr_Alignment>: Likewise.
	(gigi): Initialize double_float_alignment and double_scalar_alignment.
	* gcc-interface/utils.c (double_float_alignment): New global variable.
	(double_scalar_alignment): Likewise.
	(is_double_float_or_array): New predicate.
	(is_double_scalar_or_array): Likewise.

From-SVN: r146675