type_traits (has_nothrow_assign): Rename to has_nothrow_copy_assign.

2010-06-08  Paolo Carlini  <paolo.carlini@oracle.com>

	* include/std/type_traits (has_nothrow_assign): Rename to
	has_nothrow_copy_assign.
	(has_trivial_assign): Rename to has_trivial_copy_assign.
	* testsuite/20_util/has_nothrow_copy_assign/value.cc: New.
	* testsuite/20_util/has_nothrow_copy_assign/requirements/
	typedefs.cc: Likewise.
	* testsuite/20_util/has_nothrow_copy_assign/requirements/
	explicit_instantiation.cc: Likewise.
	* testsuite/20_util/has_trivial_copy_assign/value.cc: Likewise.
	* testsuite/20_util/has_trivial_copy_assign/requirements/
	typedefs.cc: Likewise.
	* testsuite/20_util/has_trivial_copy_assign/requirements/
	explicit_instantiation.cc: Likewise.

From-SVN: r160443