* gcc-interface: New directory.

	* ada-tree.def, cuintp.c, gigi.h, Makefile.in, targtyps.c, ada.h,
	utils.c, ada-tree.h, decl.c, lang.opt, Make-lang.in, trans.c,
	config-lang.in, deftarg.c, lang-specs.h, misc.c, utils2.c: Moved
	to gcc-interface subdirectory.

From-SVN: r138246