Member predicate LoopEntryConditionEvaluator::ignoreNonAnalyzableVariableDefinition

When evaluating a syntactic subexpression of loop condition e, we may ignore non-analyzable variable definition def for variable v, provided that def is in the body of the loop and cannot reach the loop entry point.

Example:

done = false;
while (!done) {
  f(&done); // can be ignored
}

while (...) {
  done = false;
  while (!done) {
    f(&done); // can be ignored
  }
}

done = false;
while (...) {
  while (!done) {
    f(&done); // cannot be ignored
  }
}