test: Add a test for catching pointers by reference

This test should make sure that
https://github.com/mstorsjo/llvm-mingw/issues/522 doesn't
regress again.

test/Makefile

@@ -70,7 +70,7 @@ TESTS_C_NO_BUILTIN = crt-test
 TESTS_C_ANSI_STDIO = crt-test
 TESTS_C_AS_CPP = crt-test
 TESTS_CPP = hello-cpp global-terminate tlstest-main longjmp-cleanup
-TESTS_CPP_EXCEPTIONS = hello-exception exception-locale exception-reduced
+TESTS_CPP_EXCEPTIONS = hello-exception exception-locale exception-reduced exception-catch-ptr-ref
 TESTS_CPP_STATIC = hello-exception
 TESTS_CPP_DLL = tlstest-lib throwcatch-lib
 TESTS_CPP_LINK_DLL = throwcatch-main