IIFEs should not be CFA-inlined if the FE is a generator function

[RyanCavanaugh]

This is an incorrect error because generators don't run on invocation

function wrapI() {
    const iter = (function* foo() {
        iter; // use before def error
        yield 1;
    })();
}

cc @bterlson

[bterlson]

Note that this also applies to async generators which have similar semantics when immediately invoked.

[DanielRosenwasser]

Weird because #23565 was already fixed?

[ajafff]

The use before define check doesn't use the control flow graph