* builtins.def (BUILT_IN_BCOPY, BUILT_IN_MEMMOVE): New.
	* builtin-types.def (BT_FN_VOID_CONST_PTR_PTR_SIZE): New.
	* builtins.c (expand_builtin_memmove, expand_builtin_bcopy): New
	functions.
	(expand_builtin): Handle BUILT_IN_BCOPY and BUILT_IN_MEMMOVE.

	* gcc.c-torture/execute/string-opt-19.c: New test.

From-SVN: r66169