Member predicate DeleteOrDeleteArrayExpr::getExprWithReuse

Gets the object or array being deleted, and gets a ReuseExpr when there is a destructor call and the object is also the qualifier of the call.

For example, given:

struct HasDestructor { ~HasDestructor(); };
struct PlainOldData { int x, char y; };

void f(HasDestructor* hasDestructor, PlainOldData* pod) {
  delete hasDestructor;
  delete pod;
}

This predicate yields a ReuseExpr for delete hasDestructor, as the the deleted expression has a destructor, and that expression is also the qualifier of the destructor call. In the case of delete pod the predicate does not yield a ReuseExpr, as there is no destructor call.