[perl #126573] Changed behaviour of "\r\n" in alternation regexp since Niceville

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1. Original Behaviour under Niceville

> say so "\r\n" ~~ /[";"|"\r\n"]/
True

2. As of Nov 5

% perl6 -v
This is perl6 version 2015.10-177-gaf78ecc built on MoarVM version 
2015.10-54-g1e4912d

> say so "\r\n" ~~ /[";"|"\r\n"]/
False

Note in both cases || is True.