Generalize loop memory write analyses, improve symbolic analyses.

include/base/SMPBasicBlock.h

include/base/SMPFunction.h

include/base/SMPInstr.h

include/base/SMPProgram.h

src/base/SMPBasicBlock.cpp

src/base/SMPFunction.cpp

src/base/SMPInstr.cpp

src/base/SMPProgram.cpp

src/interfaces/irdb/STARS_IRDB_Function.cpp