Move PhaseChaitin definitions from live.cpp to chaitin.cpp

create a task on behalf of my colleague Clive(verghese@amazon.com)

PhaseChaitin::verify_base_ptrs should move to chaitin.cpp.
https://hg.openjdk.java.net/jdk/jdk/file/b01985b4f88f/src/hotspot/share/opto/live.cpp#l305