Add a switch to destroy runtime only on shutdown (#4482)

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2Native.kt

@@ -250,6 +250,14 @@ class K2Native : CLICompiler<K2NativeCompilerArguments>() {
                 put(DISABLE_FAKE_OVERRIDE_VALIDATOR, arguments.disableFakeOverrideValidator)
                 putIfNotNull(PRE_LINK_CACHES, parsePreLinkCachesValue(configuration, arguments.preLinkCaches))
                 putIfNotNull(OVERRIDE_KONAN_PROPERTIES, parseOverrideKonanProperties(arguments, configuration))
+                put(DESTROY_RUNTIME_MODE, when (arguments.destroyRuntimeMode) {
+                    "legacy" -> DestroyRuntimeMode.LEGACY
+                    "on-shutdown" -> DestroyRuntimeMode.ON_SHUTDOWN
+                    else -> {
+                        configuration.report(ERROR, "Unsupported destroy runtime mode ${arguments.destroyRuntimeMode}")
+                        DestroyRuntimeMode.ON_SHUTDOWN
+                    }
+                })
             }
         }
     }

kotlin-native/backend.native/cli.bc/src/org/jetbrains/kotlin/cli/bc/K2NativeCompilerArguments.kt

@@ -285,6 +285,9 @@ class K2NativeCompilerArguments : CommonCompilerArguments() {
     )
     var overrideKonanProperties: Array<String>? = null
 
+    @Argument(value="-Xdestroy-runtime-mode", valueDescription = "<mode>", description = "When to destroy runtime. 'legacy' and 'on-shutdown' are currently supported. NOTE: 'legacy' mode is deprecated and will be removed.")
+    var destroyRuntimeMode: String? = "on-shutdown"
+
     override fun configureAnalysisFlags(collector: MessageCollector): MutableMap<AnalysisFlag<*>, Any> =
             super.configureAnalysisFlags(collector).also {
                 val useExperimental = it[AnalysisFlags.useExperimental] as List<*>