stringify __USER_LABEL_PREFIX__ in pr85248 testcase.

gcc/testsuite

	* gcc.dg/lto/pr85248_0.c (test_alias):
	Stringify __USER_LABEL_PREFIX__.
	(test_noreturn): Likewise.

From-SVN: r263769

gcc/testsuite/ChangeLog

+2018-08-22  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* gcc.dg/lto/pr85248_0.c (test_alias):
+	Stringify __USER_LABEL_PREFIX__.
+	(test_noreturn): Likewise.
+
 2018-08-22  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/86988

gcc/testsuite/gcc.dg/lto/pr85248_0.c

@@ -2,8 +2,13 @@
 /* { dg-lto-do run } */
 /* { dg-lto-options { { -flto -O2 } } } */
 
-extern void test_alias (int s, int e) __asm__ (__USER_LABEL_PREFIX__ "test");
-extern void test_noreturn (int s, int e) __asm__ (__USER_LABEL_PREFIX__ "test")
+#define STR1(X) #X
+#define STR2(X) STR1(X)
+
+extern void test_alias (int s, int e) 
+  __asm__ (STR2(__USER_LABEL_PREFIX__) "test");
+extern void test_noreturn (int s, int e)
+  __asm__ (STR2(__USER_LABEL_PREFIX__)  "test")
   __attribute__ ((__noreturn__));
 
 extern inline __attribute__ ((__always_inline__, __gnu_inline__)) void