[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: 6e74a02f85675cec270f5d931b0f6998666294a3@35560 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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