Add test for 'isHMPP' flag

idea/idea-analysis/src/org/jetbrains/kotlin/idea/project/Platform.kt

@@ -213,6 +213,9 @@ private fun Module.computeLanguageVersionSettings(): LanguageVersionSettings {
 val Module.platform: TargetPlatform?
     get() = KotlinFacetSettingsProvider.getInstance(project).getInitializedSettings(this).targetPlatform ?: project.platform
 
+val Module.isHMPPEnabled: Boolean
+    get() = KotlinFacetSettingsProvider.getInstance(project).getInitializedSettings(this).isHmppEnabled
+
 // FIXME(dsavvinov): this logic is clearly wrong in MPP environment; review and fix
 val Project.platform: TargetPlatform?
     get() {