implementations of statement processing
constraintGraph update
update intializeMethod and initializeMethodInfo
Merge branch 'changjian/constraintGraph'
Merge commit '97a2189af6a80714bd5828f9ed6fa324711ebd88' into nanzhang/io-connect

* commit '97a2189af6a80714bd5828f9ed6fa324711ebd88':
  update intializeMethod and initializeMethodInfo
  constraintGraph update
  implementations of statement processing

Conflicts:
	src/edu/uci/ics/cs243/cfa/types/OperandInfo.java