RFR(S) 8009721: Move the definition of class LRG_List

[Niclas Adlertz]

Hi all. 

Problem: 
The class PhaseLive in opto/live.hpp uses a data structure, class LRG_List, defined in opto/chaitin.hpp. Each time the class PhaseLive is used, chaitin.hpp needs to be included. This would make no sense if, for example, a new register allocator in C2 would like to use the class PhaseLive and because of this needs to include chaitin.hpp. 

Solution: 
Move the definition of the class LRG_List from opto/chaitin.hpp to opto/live.hpp.

A review would be much appreciated. 
Thank you.

Regards,
Niclas Adlertz

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WEBREV: http://cr.openjdk.java.net/~neliasso/8009721/webrev.01/
BUG: https://jbs.oracle.com/bugs/browse/JDK-8009721, http://bugs.sun.com/view_bug.do?bug_id=8009721