Some changes in test generating infrastructure:

* add separate run function for each test class to simplify and deduplicate generated code
* move the code that process IGNORE_BACKEND directive to the separate function, outside of generated code.
** it reduces size and complexity of a generated code
** it allows to mute and unmute tests w/o regenerate tests
* add an ability to generate IGNORE_BACKEND directive automatically, it's disabled by default
* add an ability to remove IGNORE_BACKEND directive automatically, it's enabled by default
* remove whitelists

js/js.tests/test/org/jetbrains/kotlin/generators/tests/GenerateJsTests.kt

@@ -17,7 +17,7 @@ fun main(args: Array<String>) {
     // TODO: repair these tests
     //generateTestDataForReservedWords()
 
-    testGroup("js/js.tests/test", "js/js.translator/testData") {
+    testGroup("js/js.tests/test", "js/js.translator/testData", testRunnerMethodName = "runTest0") {
         testClass<AbstractBoxJsTest> {
             model("box/", pattern = "^([^_](.+))\\.kt$", targetBackend = TargetBackend.JS)
         }
@@ -43,7 +43,7 @@ fun main(args: Array<String>) {
         }
     }
 
-    testGroup("js/js.tests/test", "compiler/testData") {
+    testGroup("js/js.tests/test", "compiler/testData", testRunnerMethodName = "runTest0") {
         testClass<AbstractJsCodegenBoxTest> {
             model("codegen/box", targetBackend = TargetBackend.JS)
         }