[rakudo] Make us able to use role names as type constraints again. We may have to revisit whether we want to register a Role proto at some point in the future; this gets things fixed for now.
[rakudo] Make us able to use role names as type constraints again. We may have to revisit whether we want to register a Role proto at some point in the future; this gets things fixed for now.

git-svn-id: ebc29296f9ec9cd27706eb0497c26fede0e190b2@28118 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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