testsuite - Require alias support in a test using it.

2019-06-10  Iain Sandoe  <iain@sandoe.co.uk>

	* gcc.dg/attr-copy-6.c: Require alias support.

From-SVN: r272105

gcc/testsuite/ChangeLog

+2019-06-10  Iain Sandoe  <iain@sandoe.co.uk>
+
+	* gcc.dg/attr-copy-6.c: Require alias support.
+
 2019-06-09  Marek Polacek  <polacek@redhat.com>
 
 	PR c++/65175

gcc/testsuite/gcc.dg/attr-copy-6.c

@@ -2,6 +2,7 @@
    { dg-do compile }
    { dg-skip-if "Attributes not supported" { { hppa*-*-hpux* } && { ! lp64 } } }
    { dg-options "-O2 -Wall" }
+   { dg-require-alias "" }
    { dg-require-weak "" } */
 
 #define ATTR(...)   __attribute__ ((__VA_ARGS__))