darwin, x86, testsuite - Check for an expected error on Darwin.

The test requests an alignment which exceeds the maximum object
file aligment for Darwin, rather than skipping it - test that we
see the expected error.

2019-05-25  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.target/i386/pr89261.c: Test that the alignment required
	by the test correctly produces the expected error on Darwin.

From-SVN: r271622

gcc/testsuite/ChangeLog

 2019-05-25  Iain Sandoe  <iain@sandoe.co.uk>
 
+	* gcc.target/i386/pr89261.c: Test that the alignment required
+	by the test correctly produces the expected error on Darwin.
+
+2019-05-25  Iain Sandoe  <iain@sandoe.co.uk>
+
 	* gcc.target/i386/pr82659-3.c: Require alias support.
 
 2019-05-25  Marek Polacek  <polacek@redhat.com>

gcc/testsuite/gcc.target/i386/pr89261.c

@@ -5,5 +5,6 @@
 typedef double __v2df __attribute__ ((vector_size (16), aligned (1 << 28)));
 
 __v2df foo = { 1.0, 2.0 };
+/* { dg-error {alignment of 'foo' is greater than maximum object file alignment 32768} "" { target *-*-darwin* } .-1 } */
 
-/* { dg-final { scan-assembler "\.align\[ \t]+268435456" } } */
+/* { dg-final { scan-assembler "\.align\[ \t]+268435456" { target { ! *-*-darwin* } } } } */