[OpenMP][Tests][NFC] Mark tests trying to link COI as unsupported

For some tests with target-related functionality icc 18/19 tries to link
libioffload_target.so.5, which fails for missing COI symbols.

openmp/runtime/test/api/omp_get_num_devices.c

@@ -1,4 +1,7 @@
 // RUN: %libomp-compile-and-run
+// Linking fails for icc 18
+// UNSUPPORTED: icc-18
+
 #include <stdio.h>
 #include "omp_testsuite.h"
 

openmp/runtime/test/api/omp_pause_resource.c

@@ -1,4 +1,8 @@
 // RUN: %libomp-compile-and-run
+
+// Linking fails for icc 18/19
+// UNSUPPORTED: icc-18, icc-19
+
 #include <stdio.h>
 #include "omp_testsuite.h"
 

openmp/runtime/test/critical/omp_critical_with_hint.c

@@ -1,4 +1,7 @@
 // RUN: %libomp-compile-and-run
+// critial with hint was introduced with icc 19
+// UNSUPPORTED: icc-18
+
 #include <stdio.h>
 #include <omp.h>
 #include "omp_testsuite.h"

openmp/runtime/test/teams/kmp_num_teams.c

@@ -1,5 +1,7 @@
 // RUN: %libomp-compile-and-run
 // UNSUPPORTED: gcc
+// Linking fails for icc 18/19
+// UNSUPPORTED: icc-18, icc-19
 
 #include <stdio.h>
 #include <stdlib.h>