'dessa' HIR transformation converts high-level intermediate representation into normal non-SSA state.
header file: http://svn.apache.org/viewvc/harmony/enhanced/drlvm/trunk/vm/jitrino/src/optimizer/ssa/SSA.h
implementation file: http://svn.apache.org/viewvc/harmony/enhanced/drlvm/trunk/vm/jitrino/src/optimizer/ssa/SSA.cpp