Revert "Closes #1001. Throw cannot be directly used as an expression with parens, but can appear as a statement in an expression."

This reverts commit 96b22a16eb.

lib/coffee-script/nodes.js

@@ -47,7 +47,7 @@
     };
 
     Base.prototype.compileClosure = function(o) {
-      if (this.jumps() || this instanceof Throw) {
+      if (this.jumps()) {
         throw SyntaxError('cannot use a pure statement in an expression.');
       }
       o.sharedScope = true;