Reorganize AbstractExpressionValueVisitor.visit(JBinaryExpression) for correct behaviour in case of
involved symbolic values.
Put long if-else if-.. statement in new private method for better readability.
 


git-svn-id: https://svn.sosy-lab.org/software/cpachecker/trunk@14437 4712c6d2-40bb-43ae-aa4b-fec3f1bdfe4c