* tree.h (tree_decl_with_vis): Add cxx_constructor, cxx_destructor.
	(DECL_CXX_CONSTRUCTOR_P, DECL_CXX_DESTRUCTOR_P): New macros.
	* cp-tree.h (DECL_CONSTRUCTOR_P, DECL_DESTRUCTOR_P): Use
	middle-end flag.

From-SVN: r201994