[BOLT] test: add a new test to check tied/untied tasks

This bug was reported in pmodels#51, which has
been already fixed.  This test checks if this bug has been really fixed.

Acknowledgment: the original code of this test has been created by Joseph
Schuchart ([email protected]).  Thank you.

runtime/test/bolt/misc_bugs/untied_tasks.c

@@ -0,0 +1,61 @@
+// RUN: %libomp-compile-and-run
+// REQUIRES: abt
+#include "omp_testsuite.h"
+
+int test_omp_untied_tasks()
+{
+  // https://github.com/pmodels/bolt/issues/49
+  int val = 0;
+  #pragma omp parallel
+  #pragma omp master
+  {
+    #pragma omp task untied
+    { val = 1; }
+  }
+  return val;
+}
+
+int test_omp_tied_tasks()
+{
+  int val = 0;
+  #pragma omp parallel
+  #pragma omp master
+  {
+    #pragma omp task
+    { val = 1; }
+  }
+  return val;
+}
+
+int test_omp_tied_and_untied_tasks()
+{
+  int val1 = 0;
+  int val2 = 0;
+  #pragma omp parallel
+  #pragma omp master
+  {
+    #pragma omp task
+    { val1 = 1; }
+    #pragma omp task untied
+    { val2 = 1; }
+  }
+  return val1 == 1 && val2 == 1;
+}
+
+int main()
+{
+  int i;
+  int num_failed = 0;
+  for (i = 0; i < REPETITIONS; i++) {
+    if (!test_omp_untied_tasks()) {
+      num_failed++;
+    }
+    if (!test_omp_tied_tasks()) {
+      num_failed++;
+    }
+    if (!test_omp_tied_and_untied_tasks()) {
+      num_failed++;
+    }
+  }
+  return num_failed;
+}