JVM_IR: call serialization for IR.

Serializer for IR is called when -Xserialize-ir flag is set.

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JVMCompilerArguments.kt

@@ -499,6 +499,12 @@ default: `indy-with-constants` for JVM target 9 or greater, `inline` otherwise""
     )
     var typeEnhancementImprovementsInStrictMode: Boolean by FreezableVar(false)
 
+    @Argument(
+        value = "-Xserialize-ir",
+        description = "Save IR to metadata (EXPERIMENTAL)"
+    )
+    var serializeIr: Boolean by FreezableVar(false)
+
     override fun configureAnalysisFlags(collector: MessageCollector, languageVersion: LanguageVersion): MutableMap<AnalysisFlag<*>, Any> {
         val result = super.configureAnalysisFlags(collector, languageVersion)
         result[JvmAnalysisFlags.strictMetadataVersionSemantics] = strictMetadataVersionSemantics

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/jvmArguments.kt

@@ -252,6 +252,8 @@ fun CompilerConfiguration.configureAdvancedJvmOptions(arguments: K2JVMCompilerAr
     put(JVMConfigurationKeys.NO_RESET_JAR_TIMESTAMPS, arguments.noResetJarTimestamps)
     put(JVMConfigurationKeys.NO_UNIFIED_NULL_CHECKS, arguments.noUnifiedNullChecks)
 
+    put(JVMConfigurationKeys.SERIALIZE_IR, arguments.serializeIr)
+
     if (!JVMConstructorCallNormalizationMode.isSupportedValue(arguments.constructorCallNormalizationMode)) {
         messageCollector.report(
             ERROR,