N3655 C++1y TransformationTraits Redux

	N3655 C++1y TransformationTraits Redux
	* include/std/type_traits (remove_const_t, remove_volatile_t,
	remove_cv_t, add_const_t, add_volatile_t, add_cv_t, remove_reference_t,
	add_lvalue_reference_t, add_rvalue_reference_t, make_signed_t,
	make_unsigned_t, remove_extent_t, remove_all_extents_t,
	remove_pointer_t, add_pointer_t, aligned_storage_t, decay_t,
	enable_if_t, conditional_t, common_type_t, underlying_type_t,
	result_of_t): Define.
	* doc/xml/manual/status_cxx2014.xml: Update.
	* testsuite/20_util/add_lvalue_reference/requirements/typedefs-3.cc:
	New.
	* testsuite/20_util/add_rvalue_reference/requirements/typedefs-3.cc:
	New.
	* testsuite/20_util/common_type/requirements/typedefs-3.cc: New.
	* testsuite/20_util/conditional/requirements/typedefs-2.cc: New.
	* testsuite/20_util/decay/requirements/typedefs-2.cc: New.
	* testsuite/20_util/enable_if/requirements/typedefs-2.cc: New.
	* testsuite/20_util/make_signed/requirements/typedefs-3.cc: New.
	* testsuite/20_util/make_unsigned/requirements/typedefs-3.cc: New.
	* testsuite/20_util/remove_reference/requirements/typedefs.cc: New.
	* testsuite/20_util/result_of/requirements/typedefs.cc: New.
	* testsuite/20_util/underlying_type/requirements/typedefs-3.cc: New.
	* testsuite/20_util/common_type/requirements/typedefs-2.cc: Change to
	compile-only test.
	* testsuite/20_util/decay/requirements/typedefs.cc: Likewise.
	* testsuite/20_util/make_signed/requirements/typedefs-1.cc: Likewise.
	* testsuite/20_util/declval/requirements/1_neg.cc: Adjust dg-error
	line number.
	* testsuite/20_util/make_signed/requirements/typedefs_neg.cc:
	Likewise.
	* testsuite/20_util/make_unsigned/requirements/typedefs_neg.cc:
	Likewise.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@204426 138bc75d-0d04-0410-961f-82ee72b054a4