[v3 PATCH] Implement C++17 variable templates for type traits.

[Ville Voutilainen]

Tested on Linux-x64.

2016-07-29  Ville Voutilainen  <ville.voutilainen@gmail.com>

    Implement C++17 variable templates for type traits.
    * include/std/chrono (treat_as_floating_point_v): New.
    * include/std/ratio: (ratio_equal_v, ratio_not_equal_v)
    (ratio_less_v, ratio_less_equal_v, ratio_greater_v)
    (ratio_greater_equal_v): Likewise.
    * include/std/system_error (is_error_code_enum_v)
    (is_error_condition_enum_v): Likewise.
    * include/std/tuple (tuple_size_v): Likewise.
    * type_traits: (conjunction_v, disjunction_v, negation_v)
    (is_void_v, is_null_pointer_v, is_integral_v, is_floating_point_v)
    (is_array_v, is_pointer_v, is_lvalue_reference_v)
    (is_rvalue_reference_v, is_member_object_pointer_v)
    (is_member_function_pointer_v, is_enum_v, is_union_v)
    (is_class_v, is_function_v, is_reference_v, is_arithmetic_v)
    (is_fundamental_v, is_object_v, is_scalar_v, is_compound_v)
    (is_member_pointer_v, is_const_v, is_volatile_v, is_trivial_v)
    (is_trivially_copyable_v, is_standard_layout_v)
    (is_pod_v, is_literal_type_v, is_empty_v, is_polymorphic_v)
    (is_abstract_v, is_final_v, is_signed_v, is_unsigned_v)
    (is_constructible_v, is_default_constructible_v)
    (is_copy_constructible_v, is_move_constructible_v)
    (is_assignable_v, is_copy_assignable_v, is_move_assignable_v)
    (is_destructible_v, is_trivially_constructible_v)
    (is_trivially_default_constructible_v)
     (is_trivially_copy_constructible_v, is_trivially_move_constructible_v)
    (is_trivially_assignable_v, is_trivially_copy_assignable_v)
    (is_trivially_move_assignable_v, is_trivially_destructible_v)
    (is_nothrow_constructible_v, is_nothrow_default_constructible_v)
    (is_nothrow_copy_constructible_v, is_nothrow_move_constructible_v)
    (is_nothrow_assignable_v, is_nothrow_copy_assignable_v)
    (is_nothrow_move_assignable_v, is_nothrow_destructible_v)
    (has_virtual_destructor_v, alignment_of_v, rank_v, extent_v)
    (is_same_v, is_base_of_v, is_convertible_v) : Likewise.
    * testsuite/19_diagnostics/error_code/is_error_code_v.cc: Likewise.
    * testsuite/20_util/duration/requirements/treat_as_floating_point_v.cc:
    Likewise.
    * testsuite/20_util/duration/requirements/treat_as_floating_point_v.cc:
    Likewise.
    * testsuite/20_util/ratio/requirements/ratio_equal_v.cc: Likewise.
    * testsuite/20_util/tuple/tuple_size_v.cc: Likewise.
    * testsuite/20_util/variable_templates_for_traits.cc: Likewise.
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