* lib/target-supports.exp (check_effective_default_packed): New proc.
	* g++.dg/ext/packed3.C, g++.dg/ext/packed8.C, g++.dg/other/crash-4.C:
	Gate expected errors on target ! default_packed.
	* g++.dg/ext/packed4.C: Gate on target ! default_packed.

From-SVN: r106374