Fixes a set of crashes observed by @jonathan-m-phillips on Randoop of the following form:
Exception: java.lang.IllegalStateException,
Message: this.cumulativeSize is not NameExpr, it is FieldAccessExpr\,
Example: com.github.javaparser.ast.expr.Expression.asNameExpr(Expression.java:332)\
Fixes a set of crashes observed by @jonathan-m-phillips on Randoop of the following form: