ifStatementRemoval optimization does not handle all edge cases

[emilos]

Currently, if the code like this is generated by the engine due to inlining:

if (null) {} else if (true) {
  __t += "foo";
}

if (null) {} else if (!null) {
  __t += "foo";
}

if (void 0 !== void 0) {} else {
  __t += "foo";
}

if (typeof void 0 === "undefined") {
  __t += "foo";
} else {}

then the Optimizer should simplify it to:

__t += "foo";

unfortunately these edge cases were missed in the astoptech dependency.

Acceptance criteria

• handle the above edge cases in the ifStatementRemoval of the astoptech dependency