[rakudo] Since when we are parsing a signature we may be doing it for a package now (e.g. a parameterized role), we may already have got a block created. So check for this and use the existing one if so (otherwise we lose $block<pkgdecl>).
[rakudo] Since when we are parsing a signature we may be doing it for a package now (e.g. a parameterized role), we may already have got a block created. So check for this and use the existing one if so (otherwise we lose $block<pkgdecl>).

git-svn-id: ebc29296f9ec9cd27706eb0497c26fede0e190b2@35560 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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