Fix new sancov tests

* gcc.dg/sancov/sancov.exp: Load asan-dg.exp.
	* gcc.dg/sancov/asan.c: Don't run when asan is not available.

From-SVN: r231364

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2015-12-06  Dmitry Vyukov  <dvyukov@google.com>
+
+	* gcc.dg/sancov/sancov.exp: Load asan-dg.exp.
+	* gcc.dg/sancov/asan.c: Don't run when asan is not available.
+
 2015-12-07  Nathan Sidwell  <nathan@acm.org>
 
 	* gcc.target/nvptx/decl-init.c: New.

gcc/testsuite/gcc.dg/sancov/asan.c

@@ -3,7 +3,7 @@
      - coverage does not instrument asan-emitted basic blocks
      - asan considers coverage callback as "nonfreeing" (thus 1 asan store
        callback.  */
-/* { dg-do compile } */
+/* { dg-do compile { target fsanitize_address } } */
 /* { dg-options "-fsanitize-coverage=trace-pc -fsanitize=address -fdump-tree-optimized" } */
 
 void foo(volatile int *a, int *b)

gcc/testsuite/gcc.dg/sancov/sancov.exp

@@ -17,6 +17,7 @@
 # <http://www.gnu.org/licenses/>.
 
 load_lib gcc-dg.exp
+load_lib asan-dg.exp
 load_lib torture-options.exp
 
 dg-init