Provide shortcuts for producing quick compiler for maven and rebuilding stdlib-js from ant.

libraries/stdlib/js/build.gradle

@@ -227,8 +227,13 @@ artifacts {
     archives javadocJar
 }
 
+task distJs(type: Copy) {
+    from(compileJs)
+    into "$distDir/js"
+}
 
 dist {
+    dependsOn distJs
     [mergedJar, sourcesJar].forEach {
         from(it)
         // legacy
@@ -236,9 +241,6 @@ dist {
             rename("kotlin-stdlib-js", 'kotlin-jslib')
         }
     }
-    from(compileJs) {
-        into '../../js'
-    }
 }