Add 'std::bad_cast' exception test cases for GCN, nvptx target and OpenACC, OpenMP 'target' offloading

gcc/testsuite/
	* g++.target/gcn/exceptions-bad_cast-1.C: New.
	* g++.target/nvptx/exceptions-bad_cast-1.C: Likewise.
	libgomp/
	* testsuite/libgomp.c++/target-exceptions-bad_cast-1.C: New.
	* testsuite/libgomp.oacc-c++/exceptions-bad_cast-1.C: Likewise.

gcc/testsuite/g++.target/gcn/exceptions-bad_cast-1.C

@@ -0,0 +1,15 @@
+/* 'std::bad_cast' exception.  */
+
+/* { dg-do run } */
+/* Via the magic string "-std=*++" indicate that testing one (the default) C++ standard is sufficient.  */
+/* { dg-additional-options -fexceptions } */
+/* { dg-additional-options -fdump-tree-optimized-raw } */
+
+#include "../../../../libgomp/testsuite/libgomp.oacc-c++/exceptions-bad_cast-1.C"
+
+/* { dg-output {CheCKpOInT[\r\n]+} }
+
+   { dg-final { scan-tree-dump-times {gimple_call <__cxa_bad_cast, } 1 optimized } }
+   We don't print anything, but just 'abort'.
+
+   { dg-shouldfail {'std::bad_cast' exception} } */

gcc/testsuite/g++.target/nvptx/exceptions-bad_cast-1.C

@@ -0,0 +1,15 @@
+/* 'std::bad_cast' exception.  */
+
+/* { dg-do run } */
+/* Via the magic string "-std=*++" indicate that testing one (the default) C++ standard is sufficient.  */
+/* { dg-additional-options -fexceptions } */
+/* { dg-additional-options -fdump-tree-optimized-raw } */
+
+#include "../../../../libgomp/testsuite/libgomp.oacc-c++/exceptions-bad_cast-1.C"
+
+/* { dg-output {CheCKpOInT[\r\n]+} }
+
+   { dg-final { scan-tree-dump-times {gimple_call <__cxa_bad_cast, } 1 optimized } }
+   We don't print anything, but just 'abort'.
+
+   { dg-shouldfail {'std::bad_cast' exception} } */

libgomp/testsuite/libgomp.c++/target-exceptions-bad_cast-1.C

@@ -0,0 +1,25 @@
+/* 'std::bad_cast' exception in OpenMP 'target' region.  */
+
+/* { dg-require-effective-target exceptions }
+   { dg-additional-options -fexceptions } */
+/* { dg-additional-options -fdump-tree-optimized-raw }
+   { dg-additional-options -foffload-options=-fdump-tree-optimized-raw } */
+
+#include "../libgomp.oacc-c++/exceptions-bad_cast-1.C"
+
+/* { dg-output {CheCKpOInT[\r\n]+} }
+
+   { dg-final { scan-tree-dump-times {gimple_call <__cxa_bad_cast, } 1 optimized } }
+   { dg-final { scan-offload-tree-dump-times {gimple_call <__cxa_bad_cast, } 1 optimized } }
+   For host execution, we print something like:
+       terminate called after throwing an instance of 'std::bad_cast'
+         what():  std::bad_cast
+       Aborted (core dumped)
+   { dg-output {.*std::bad_cast} { target { ! offload_device } } }
+   For GCN, nvptx offload execution, we don't print anything, but just 'abort'.
+
+   TODO For GCN, nvptx offload execution, this currently doesn't 'abort' due to
+   the 'std::bad_cast' exception, but rather due to SIGSEGV in 'dynamic_cast';
+   PR119692.
+
+   { dg-shouldfail {'std::bad_cast' exception} } */

libgomp/testsuite/libgomp.oacc-c++/exceptions-bad_cast-1.C

@@ -0,0 +1,54 @@
+/* 'std::bad_cast' exception in OpenACC compute region.  */
+
+/* { dg-require-effective-target exceptions }
+   { dg-additional-options -fexceptions } */
+/* { dg-additional-options -fdump-tree-optimized-raw }
+   { dg-additional-options -foffload-options=-fdump-tree-optimized-raw } */
+
+/* See also '../libgomp.c++/target-exceptions-bad_cast-1.C'.  */
+
+/* See also '../../../gcc/testsuite/g++.target/gcn/exceptions-bad_cast-1.C',
+   '../../../gcc/testsuite/g++.target/nvptx/exceptions-bad_cast-1.C'.  */
+
+#include <iostream>
+
+struct C1
+{
+  virtual void f()
+  {}
+};
+
+struct C2 : C1
+{
+};
+
+int main()
+{
+  std::cerr << "CheCKpOInT\n";
+#pragma omp target
+#pragma acc serial
+  /* { dg-bogus {using 'vector_length \(32\)', ignoring 1} {} { target openacc_nvidia_accel_selected xfail *-*-* } .-1 } */
+  {
+    C1 c1;
+    [[maybe_unused]]
+    C2 &c2 = dynamic_cast<C2 &>(c1);
+    /* 'std::bad_cast' is thrown.  */
+  }
+}
+
+/* { dg-output {CheCKpOInT[\r\n]+} }
+
+   { dg-final { scan-tree-dump-times {gimple_call <__cxa_bad_cast, } 1 optimized } }
+   { dg-final { scan-offload-tree-dump-times {gimple_call <__cxa_bad_cast, } 1 optimized } }
+   For host execution, we print something like:
+       terminate called after throwing an instance of 'std::bad_cast'
+         what():  std::bad_cast
+       Aborted (core dumped)
+   { dg-output {.*std::bad_cast} { target openacc_host_selected } }
+   For GCN, nvptx offload execution, we don't print anything, but just 'abort'.
+
+   TODO For GCN, nvptx offload execution, this currently doesn't 'abort' due to
+   the 'std::bad_cast' exception, but rather due to SIGSEGV in 'dynamic_cast';
+   PR119692.
+
+   { dg-shouldfail {'std::bad_cast' exception} } */