builtins.c (expand_builtin_memmove): Optimize memmove (x, y, 1) into memcpy (x, y, 1) if memcpy can be expanded inline.

	* builtins.c (expand_builtin_memmove): Optimize memmove (x, y, 1)
	into memcpy (x, y, 1) if memcpy can be expanded inline.

	* gcc.c-torture/execute/builtins/memmove.c (main_test): Formatting.
	* gcc.c-torture/execute/builtins/memmove-2.c: New test.
	* gcc.c-torture/execute/builtins/memmove-2-lib.c: New.

From-SVN: r87539