c++: add passing testcases [PR120243]

These pass now; the first was fixed by r16-1507.

	PR c++/120243

gcc/testsuite/ChangeLog:

	* g++.dg/coroutines/torture/pr120243-unhandled-1.C: New test.
	* g++.dg/coroutines/torture/pr120243-unhandled-2.C: New test.

(cherry picked from commit 2492bab503f57f2cf6e08e5c104f7a1d31d34047)
2 files changed