Dependency of js tests generation on compiler test data generation (KTI-404)

There was an error during "Generate Compiler Tests" execution:

Exception in thread "main" java.lang.RuntimeException: java.io.FileNotFoundException: compiler\testData\codegen\box\ranges\expression\inexactDownToMinValue.kt

The error was probable caused by parallel execution of tasks:compiler:generateTests and :js:js.tests:generateTests.

Exception could occur when GenerateRangesCodegenTestData.main(args) has
just removed directory with test data for regeneration but
:js:js.tests:generateTests had already seen files present.

 #KTI-404 Fixed

buildSrc/src/main/kotlin/CommonUtil.kt

@@ -54,11 +54,12 @@ var Project.javaHome: String?
         extra["javaHome"] = v
     }
 
-fun Project.generator(fqName: String, sourceSet: SourceSet? = null) = smartJavaExec {
+fun Project.generator(fqName: String, sourceSet: SourceSet? = null, configure: JavaExec.() -> Unit = {}) = smartJavaExec {
     classpath = (sourceSet ?: testSourceSet).runtimeClasspath
     mainClass.set(fqName)
     workingDir = rootDir
     systemProperty("line.separator", "\n")
+    configure()
 }
 
 fun Project.getBooleanProperty(name: String): Boolean? = this.findProperty(name)?.let {