[JS IR] Introduce the GENERATE_INLINE_ANONYMOUS_FUNCTIONS feature flag

compiler/cli/cli-common/src/org/jetbrains/kotlin/cli/common/arguments/K2JSCompilerArguments.kt

@@ -178,6 +178,12 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     @Argument(value = "-Xir-new-ir2js", description = "New fragment-based ir2js")
     var irNewIr2Js: Boolean by FreezableVar(true)
 
+    @Argument(
+        value = "-Xir-generate-inline-anonymous-functions",
+        description = "Lambda expressions that capture values are translated into in-line anonymous JavaScript functions"
+    )
+    var irGenerateInlineAnonymousFunctions: Boolean by FreezableVar(false)
+
     @Argument(
         value = "-Xinclude",
         valueDescription = "<path>",

compiler/cli/cli-js/src/org/jetbrains/kotlin/cli/js/K2JsIrCompiler.kt

@@ -163,6 +163,7 @@ class K2JsIrCompiler : CLICompiler<K2JSCompilerArguments>() {
         configurationJs.put(CLIConfigurationKeys.ALLOW_KOTLIN_PACKAGE, arguments.allowKotlinPackage)
         configurationJs.put(CLIConfigurationKeys.RENDER_DIAGNOSTIC_INTERNAL_NAME, arguments.renderInternalDiagnosticNames)
         configurationJs.put(JSConfigurationKeys.PROPERTY_LAZY_INITIALIZATION, arguments.irPropertyLazyInitialization)
+        configurationJs.put(JSConfigurationKeys.GENERATE_INLINE_ANONYMOUS_FUNCTIONS, arguments.irGenerateInlineAnonymousFunctions)
 
         if (!checkKotlinPackageUsage(environmentForJS.configuration, sourcesFiles)) return ExitCode.COMPILATION_ERROR