[Darwin, PPC, testsuite] Fix spec-barr-1.c for Darwin.

We just needed to adjust the regex to accept Darwin's register names.

2019-06-24  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.target/powerpc/spec-barr-1.c: Adjust scan assembler regex
	to recognise Darwin's register names.

From-SVN: r272626

gcc/testsuite/ChangeLog

 2019-06-24  Iain Sandoe  <iain@sandoe.co.uk>
 
+	* gcc.target/powerpc/spec-barr-1.c: Adjust scan assembler regex
+	to recognise Darwin's register names.
+
+2019-06-24  Iain Sandoe  <iain@sandoe.co.uk>
+
 	* gcc.dg/cpp/isysroot-1.c: Use <example.h> as the test header.
 	* gcc.dg/cpp/usr/include/stdio.h: Rename...
 	* gcc.dg/cpp/usr/include/example.h: ... to this.

gcc/testsuite/gcc.target/powerpc/spec-barr-1.c

@@ -6,4 +6,4 @@ void foo ()
   __builtin_ppc_speculation_barrier ();
 }
 
-/* { dg-final { scan-assembler "ori 31,31,0" } } */
+/* { dg-final { scan-assembler {ori\s+r?31,r?31,r?0} } } */