Add a few leak check tests.

These tests are meant to replace the leak check tests from libbacktrace.

Bug: 120606663

Test: Ran tests on host and target.
Change-Id: I928b199304afc36b4bac78e9a2cd688b6f2910b9
diff --git a/libunwindstack/tests/TestUtils.h b/libunwindstack/tests/TestUtils.h
index 8c31aa6..a4d7b9b 100644
--- a/libunwindstack/tests/TestUtils.h
+++ b/libunwindstack/tests/TestUtils.h
@@ -50,6 +50,8 @@
   return ready;
 }
 
+void TestCheckForLeaks(void (*unwind_func)(void*), void* data);
+
 }  // namespace unwindstack
 
 #endif  // _LIBUNWINDSTACK_TESTS_TEST_UTILS_H