Add fingerprint for swift bug 1288918

Although we normally don't like using tempest output in a fingerprint,
this test is very limited in scope and we don't know of a better
fingerprint.

Change-Id: I5a1fa0f1b80abd49b5d69f57155cf3bf7b8f46d1
Related-Bug: #1288918
Merge "Add fingerprint for swift bug 1288918"