Fix some parsing edge cases for :: operator.

test/core/fixtures/transformation/es7.function-bind/bind/actual.js

@@ -1,2 +1,3 @@
 var f = ctx::ns.obj.func;
 var g = ::ns.obj.func;
+var h = new X::y;

test/core/fixtures/transformation/es7.function-bind/bind/expected.js

@@ -4,3 +4,4 @@ var _context;
 
 var f = (_context = ctx, ns.obj.func).bind(_context);
 var g = (_context = ns.obj).func.bind(_context);
+var h = (_context = new X(), y).bind(_context);