Add test cases for noreorder

Add some simple test cases for noreorder behaving like
-fno-toplevel-reorder and -fno-toplevel-reorder still working.

gcc/testsuite/:

2014-09-23  Andi Kleen  <ak@linux.intel.com>

	* gcc.dg/noreorder.c: New test.
	* gcc.dg/noreorder2.c: New test.
	* gcc.dg/noreorder3.c: New test.
	* gcc.dg/noreorder4.c: New test.

From-SVN: r215538

gcc/testsuite/ChangeLog

+2014-09-23  Andi Kleen  <ak@linux.intel.com>
+
+	* gcc.dg/noreorder.c: New test.
+	* gcc.dg/noreorder2.c: New test.
+	* gcc.dg/noreorder3.c: New test.
+	* gcc.dg/noreorder4.c: New test.
+
 2014-09-23  Alan Lawrence  <alan.lawrence@arm.com>
 
 	* gcc.dg/combine_ashiftrt_1.c: New test.

gcc/testsuite/gcc.dg/noreorder.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+/* The function order in this file is opposite from what the cgraph
+   topological sort would output. So we can check the order is preserved. */
+
+extern void f2(int);
+static int func2(void);
+
+#ifndef NOREORDER
+#define NOREORDER __attribute__((no_reorder))
+#endif
+
+asm("firstasm");
+
+NOREORDER __attribute__((noinline)) int bozo(void)
+{
+  f2(3);
+  func2();
+}
+
+asm("jukjuk");
+
+NOREORDER __attribute__((noinline)) static int func1(void)
+{
+  f2(1);
+}
+
+asm("barbar");
+
+NOREORDER __attribute__((noinline)) static int func2(void)
+{
+  func1();
+}
+
+asm("lastasm");
+
+/* { dg-final { scan-assembler "firstasm.*bozo.*jukjuk.*func1.*barbar.*func2.*lastasm" } } */

gcc/testsuite/gcc.dg/noreorder2.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-toplevel-reorder" } */
+
+__attribute__((no_reorder)) int foobar;
+
+static int barbar;
+int bozo;
+
+/* { dg-final { scan-assembler "foobar" } } */
+/* { dg-final { scan-assembler "bozo" } } */
+/* { dg-final { scan-assembler "barbar" } } */

gcc/testsuite/gcc.dg/noreorder3.c

+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+__attribute__((no_reorder)) int foobar;
+static int barbar;
+int bozo;
+
+/* { dg-final { scan-assembler "foobar" } } */
+/* { dg-final { scan-assembler "bozo" } } */
+/* { dg-final { scan-assembler-not "barbar" } } */

gcc/testsuite/gcc.dg/noreorder4.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -fno-toplevel-reorder" } */
+#define NOREORDER
+#include "noreorder.c"
+/* { dg-final { scan-assembler "bozo.*jukjuk.*func1.*barbar.*func2" } } */