darwin, testsuite fix PR27221

The test can't succeed on 32b powerpc Darwin since the
ABI demands a different result to the tested one.

2019-05-22  Iain Sandoe  <iain@sandoe.co.uk>

	PR testsuite/27221
	* g++.dg/ext/alignof2.C: XFAIL for 32bit Darwin.

From-SVN: r271505

gcc/testsuite/ChangeLog

+2019-05-22  Iain Sandoe  <iain@sandoe.co.uk>
+
+	PR testsuite/27221
+	* g++.dg/ext/alignof2.C: XFAIL for 32bit Darwin.
+
 2019-05-22  Martin Liska  <mliska@suse.cz>
 
 	PR lto/90500

gcc/testsuite/g++.dg/ext/alignof2.C

@@ -3,7 +3,7 @@
 // wrong for some fields.
 
 // { dg-do run }
-// { dg-xfail-run-if "AIX ABI increases struct alignment for first member double" { powerpc-ibm-aix* } }
+// { dg-xfail-run-if "AIX/Darwin ABI increases struct alignment for first member double" { powerpc-ibm-aix* || { ilp32 && powerpc-*-darwin* } } }
 
 extern "C" void abort();