JPS build: workarounds for idea importing

compiler/build.gradle.kts

@@ -74,6 +74,11 @@ dependencies {
 
     antLauncherJar(commonDep("org.apache.ant", "ant"))
     antLauncherJar(files(toolsJar()))
+
+    // For JPS build
+    if (System.getProperty("idea.active") != null) {
+        testRuntimeOnly(files("${rootProject.projectDir}/dist/kotlinc/lib/kotlin-reflect.jar"))
+    }
 }
 
 sourceSets {