Add xfails to libgomp tests target-{33,34}.c, target-link-1.c

Add xfails for nvptx offloading because
"no GOMP_OFFLOAD_async_run implemented in plugin-nvptx.c"
(https://gcc.gnu.org/PR81688) and because
"omp target link not implemented for nvptx"
(https://gcc.gnu.org/PR81689).

libgomp/
	* testsuite/libgomp.c/target-33.c: Add xfail for execution on
	offload_target_nvptx, cf. https://gcc.gnu.org/PR81688.
	* testsuite/libgomp.c/target-34.c: Likewise.
	* testsuite/libgomp.c/target-link-1.c: Add xfail for
	offload_target_nvptx, cf. https://gcc.gnu.org/PR81689.

libgomp/ChangeLog

+
+2020-02-10  Frederik Harwath  <frederik@codesourcery.com>
+
+	* testsuite/libgomp.c/target-33.c: Add xfail for execution on
+	offload_target_nvptx, cf. https://gcc.gnu.org/PR81688.
+	* testsuite/libgomp.c/target-34.c: Likewise.
+	* testsuite/libgomp.c/target-link-1.c: Add xfail for
+	offload_target_nvptx, cf. https://gcc.gnu.org/PR81689.
+
 2020-02-09  Jakub Jelinek  <jakub@redhat.com>
 
 	* testsuite/libgomp.c/target-38.c: New test.

libgomp/testsuite/libgomp.c/target-33.c

+/* { dg-xfail-run-if "GOMP_OFFLOAD_async_run not implemented" { offload_target_nvptx } }
+   Cf. https://gcc.gnu.org/PR81688.  */
+
 extern void abort (void);
 
 int

libgomp/testsuite/libgomp.c/target-34.c

+/* { dg-xfail-run-if "GOMP_OFFLOAD_async_run not implemented" { offload_target_nvptx } }
+   Cf. https://gcc.gnu.org/PR81688.  */
+
 extern void abort (void);
 
 int

libgomp/testsuite/libgomp.c/target-link-1.c

+/* { dg-xfail-if "#pragma omp target link not implemented" { offload_target_nvptx } }
+   Cf. https://gcc.gnu.org/PR81689.  */
+
 struct S { int s, t; };
 
 int a = 1, b = 1;