Fix test case failures for pdp11 target.

Fix test case failures for pdp11 target.

	* gcc.c-torture/execute/builtins/lib/chk.c: Use smaller alignment
	if pdp11.
	* gcc.c-torture/compile/20010518-2.c: Skip if pdp11 -mint32.
	* gcc.c-torture/compile/20040101-1.c: Ditto.
	* gcc.c-torture/compile/20050622-1.c: Ditto.
	* gcc.c-torture/compile/20080625-1.c: Ditto.
	* gcc.c-torture/compile/20090107-1.c: Ditto.
	* gcc.c-torture/compile/920501-12.c: Ditto.
	* gcc.c-torture/compile/920501-4.c: Ditto.
	* gcc.c-torture/compile/961203-1.c: Ditto.
	* gcc.c-torture/compile/limits-externdecl.c: Ditto.
	* gcc.c-torture/compile/pr25310.c: Ditto.

From-SVN: r261897