[ES6] Implemented parse for export Name from Module variants. (#1701)

- add `AST_Export` new variants output
- add tests to `test/compress/`
- update `$propdoc` of `AST_Export` ("exported_names" & "module_name")
- add tests for `export ...  as ...` variants

test/mocha/issue1702.js

@@ -0,0 +1,35 @@
+var uglify = require('../../');
+var assert = require("assert");
+
+describe("For statement", function() {
+    it("For variable should list enclosing scope in its references (issue #17022)", function() {
+        var ast = uglify.parse("function f() { for (var a = 0; a < 10; a++) {} }");
+        ast.figure_out_scope();
+
+        var checkWalker = new uglify.TreeWalker(function(node, descend) {
+            if (node instanceof uglify.AST_VarDef) {
+                console.log("AST_VarDef");
+                // one reference should be in the AST_Defun scope - search for it
+
+                var walkNode = function (r) {
+                    console.log(r.CTOR.name);
+                    var walker = new uglify.TreeWalker(function(node, descend){
+                        // do not walk into any other scope, it should be listed if needed
+                        console.log("  " + node.CTOR.name);
+                        if (node instanceof uglify.AST_Scope && node != r.scope) return true;
+                        if (node instanceof uglify.AST_For) {
+                            console.log("Great - we found the for statement referencing the variable")
+                        }
+                        return false;
+                    });
+                    r.scope.walk(walker);
+                    r.walk(walker);
+                };
+
+                node.name.thedef.orig.forEach(walkNode);
+                node.name.thedef.references.forEach(walkNode);
+            }
+        });
+        ast.walk(checkWalker);
+    });
+});