Add 'libgomp.c++/target-std__[...]-concurrent-usm.C' test cases for C++ 'std::flat_map', 'std::flat_multimap', 'std::flat_multiset', 'std::flat_set'

libgomp/
	* testsuite/libgomp.c++/target-std__flat_map-concurrent-usm.C:
	New.
	* testsuite/libgomp.c++/target-std__flat_multimap-concurrent-usm.C:
	Likewise.
	* testsuite/libgomp.c++/target-std__flat_multiset-concurrent-usm.C:
	Likewise.
	* testsuite/libgomp.c++/target-std__flat_set-concurrent-usm.C:
	Likewise.
	* testsuite/libgomp.c++/target-std__flat_map-concurrent.C: Adjust.
	* testsuite/libgomp.c++/target-std__flat_multimap-concurrent.C:
	Likewise.
	* testsuite/libgomp.c++/target-std__flat_multiset-concurrent.C:
	Likewise.
	* testsuite/libgomp.c++/target-std__flat_set-concurrent.C:
	Likewise.

libgomp/testsuite/libgomp.c++/target-std__flat_map-concurrent-usm.C

@@ -0,0 +1,8 @@
+// { dg-additional-options "-std=c++23" }
+
+/* { dg-require-effective-target omp_usm } */
+#pragma omp requires unified_shared_memory self_maps
+#define OMP_USM
+#define MEM_SHARED
+
+#include "target-std__flat_map-concurrent.C"

libgomp/testsuite/libgomp.c++/target-std__flat_map-concurrent.C

@@ -39,7 +39,9 @@ int main (void)
   init (keys, true);
   init (data, false);
 
+#ifndef MEM_SHARED
   #pragma omp target enter data map (to: keys[ :N], data[ :N]) map (alloc: _map)
+#endif
 
   #pragma omp target
     {
@@ -55,12 +57,22 @@ int main (void)
     for (int i = 0; i < N; ++i)
       sum += (long long) keys[i] * _map[keys[i]];
 
+#ifdef OMP_USM
+  #pragma omp target
+    /* Restore the object into pristine state.  In particular, deallocate
+       any memory allocated during device execution, which otherwise, back
+       on the host, we'd SIGSEGV on, when attempting to deallocate during
+       destruction of the object.  */
+    __typeof__ (_map){}.swap (_map);
+#endif
 #ifndef MEM_SHARED
   #pragma omp target
     _map.~flat_map ();
 #endif
 
+#ifndef MEM_SHARED
   #pragma omp target exit data map (release: _map)
+#endif
 
   bool ok = validate (sum, keys, data);
   return ok ? 0 : 1;

libgomp/testsuite/libgomp.c++/target-std__flat_multimap-concurrent-usm.C

@@ -0,0 +1,8 @@
+// { dg-additional-options "-std=c++23" }
+
+/* { dg-require-effective-target omp_usm } */
+#pragma omp requires unified_shared_memory self_maps
+#define OMP_USM
+#define MEM_SHARED
+
+#include "target-std__flat_multimap-concurrent.C"

libgomp/testsuite/libgomp.c++/target-std__flat_multimap-concurrent.C

@@ -33,7 +33,9 @@ int main (void)
   init (keys, KEY_MAX);
   init (data, RAND_MAX);
 
+#ifndef MEM_SHARED
   #pragma omp target enter data map (to: keys[ :N], data[ :N]) map (alloc: _map)
+#endif
 
   #pragma omp target
     {
@@ -54,12 +56,22 @@ int main (void)
 	}
       }
 
+#ifdef OMP_USM
+  #pragma omp target
+    /* Restore the object into pristine state.  In particular, deallocate
+       any memory allocated during device execution, which otherwise, back
+       on the host, we'd SIGSEGV on, when attempting to deallocate during
+       destruction of the object.  */
+    __typeof__ (_map){}.swap (_map);
+#endif
 #ifndef MEM_SHARED
   #pragma omp target
     _map.~flat_multimap ();
 #endif
 
+#ifndef MEM_SHARED
   #pragma omp target exit data map (release: _map)
+#endif
 
   bool ok = validate (sum, keys, data);
   return ok ? 0 : 1;

libgomp/testsuite/libgomp.c++/target-std__flat_multiset-concurrent-usm.C

@@ -0,0 +1,8 @@
+// { dg-additional-options "-std=c++23" }
+
+/* { dg-require-effective-target omp_usm } */
+#pragma omp requires unified_shared_memory self_maps
+#define OMP_USM
+#define MEM_SHARED
+
+#include "target-std__flat_multiset-concurrent.C"

libgomp/testsuite/libgomp.c++/target-std__flat_multiset-concurrent.C

@@ -34,7 +34,9 @@ int main (void)
   srand (time (NULL));
   init (data);
 
+#ifndef MEM_SHARED
   #pragma omp target data map (to: data[ :N]) map (alloc: set)
+#endif
     {
       #pragma omp target
 	{
@@ -49,6 +51,14 @@ int main (void)
 	for (int i = 0; i < MAX; ++i)
 	  sum += i * set.count (i);
 
+#ifdef OMP_USM
+      #pragma omp target
+	/* Restore the object into pristine state.  In particular, deallocate
+	   any memory allocated during device execution, which otherwise, back
+	   on the host, we'd SIGSEGV on, when attempting to deallocate during
+	   destruction of the object.  */
+	__typeof__ (set){}.swap (set);
+#endif
 #ifndef MEM_SHARED
       #pragma omp target
 	set.~flat_multiset ();

libgomp/testsuite/libgomp.c++/target-std__flat_set-concurrent-usm.C

@@ -0,0 +1,8 @@
+// { dg-additional-options "-std=c++23" }
+
+/* { dg-require-effective-target omp_usm } */
+#pragma omp requires unified_shared_memory self_maps
+#define OMP_USM
+#define MEM_SHARED
+
+#include "target-std__flat_set-concurrent.C"

libgomp/testsuite/libgomp.c++/target-std__flat_set-concurrent.C

@@ -40,7 +40,9 @@ int main (void)
   srand (time (NULL));
   init (data);
 
+#ifndef MEM_SHARED
   #pragma omp target data map (to: data[ :N]) map (alloc: _set)
+#endif
     {
       #pragma omp target
 	{
@@ -56,6 +58,14 @@ int main (void)
 	  if (_set.count (i) > 0)
 	    sum += i;
 
+#ifdef OMP_USM
+      #pragma omp target
+	/* Restore the object into pristine state.  In particular, deallocate
+	   any memory allocated during device execution, which otherwise, back
+	   on the host, we'd SIGSEGV on, when attempting to deallocate during
+	   destruction of the object.  */
+	__typeof__ (_set){}.swap (_set);
+#endif
 #ifndef MEM_SHARED
       #pragma omp target
 	_set.~flat_set ();