RFR 8225198 : Optimize regex tree for greedy quantifiers of type {N, }

[Ivan Gerasimov]

Hello!

When building a match-tree, the regex engine optimizes '*' and '+' 
greedy quantifiers by using special node of type CharPropertyGreedy.

This later class can be used unmodified for other greedy quantifiers 
without the upper limit, i.e. of type '{N,}'.

Would you please help review this simple optimization?

BUGURL: https://bugs.openjdk.java.net/browse/JDK-8225198
WEBREV: http://cr.openjdk.java.net/~igerasim/8225198/00/webrev/

(With the fix, one unused class was also removed.  This class was to 
implement conditionals, which were never supported by Java regexs.)

-- 
With kind regards,
Ivan Gerasimov