Specify idea.home.path for java 8 tests

Default discovery mechanism points to wrong location

compiler/tests-java8/build.gradle.kts

@@ -28,6 +28,7 @@ projectTest {
     dependsOn(":dist")
     workingDir = rootDir
     systemProperty("kotlin.test.script.classpath", the<JavaPluginConvention>().sourceSets.getByName("test").output.classesDirs.joinToString(File.pathSeparator))
+    systemProperty("idea.home.path", intellijRootDir().canonicalPath)
 }
 
 val generateTests by generator("org.jetbrains.kotlin.generators.tests.GenerateJava8TestsKt")