[rakudo] Add :nth() and :x() flags to .subst($str,$repl) and .subst($regex,$repl)
[rakudo] Add :nth() and :x() flags to .subst($str,$repl) and .subst($regex,$repl)

git-svn-id: ebc29296f9ec9cd27706eb0497c26fede0e190b2@33546 d31e2699-5ff4-0310-a27c-f18f2fbe73fe

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