[CS2] Fix #3709, #3789: ‘throw’ an ‘if’, ‘for’, ‘switch’, ‘while’ (#4664)

* Fix #3709: throwing an if, for, switch or while should throw the returned value of the statement/loop

* Fix #3789: don’t throw a throw (unless it’s in a closure)

* LEVEL_LIST works better than a list of node types

lib/coffeescript/nodes.js

@@ -4774,7 +4774,7 @@
 
       compileNode(o) {
         var fragments;
-        fragments = this.expression.compileToFragments(o);
+        fragments = this.expression.compileToFragments(o, LEVEL_LIST);
         unshiftAfterComments(fragments, this.makeCode('throw '));
         fragments.unshift(this.makeCode(this.tab));
         fragments.push(this.makeCode(';'));