* gdb.base/corefile.exp: Always regenerate the core file, since

	* gdb.base/corefile.exp: Always regenerate the core file, since
	we always regenerate the coremaker program.  Detect special case
	where registers cannot be read from core file.  Change setup_xfail
	for "print func2:coremaker_local" and "backtrace in corefile.exp"
	to fail for all i*86 targets.