[Patch, testsuite] Require scheduling support for test that uses -fschedule-insns

[Senthil Kumar Selvaraj]

gcc.dg/torture/alias-1.c specifies -fschedule-insns in its dg-options,
and this causes it to fail for targets that don't support that option.

This patch makes the test unsupported for those targets. 

If ok, could someone apply please? I don't have commit access.

Regards
Senthil

gcc/testsuite/ChangeLog
2013-05-01  Senthil Kumar Selvaraj  <senthil_kumar.selvaraj@atmel.com>

	* gcc.dg/torture/alias-1.c: Add dg-require-effective-target
	scheduling.


diff --git gcc/testsuite/gcc.dg/torture/alias-1.c gcc/testsuite/gcc.dg/torture/alias-1.c
index 1e60341..92b8809 100644
--- gcc/testsuite/gcc.dg/torture/alias-1.c
+++ gcc/testsuite/gcc.dg/torture/alias-1.c
@@ -1,5 +1,6 @@
 /* { dg-do run } */
 /* { dg-options "-fschedule-insns" } */
+/* { dg-require-effective-target scheduling } */
 
 extern void abort (void) __attribute__((noreturn));