[K/JS] Add the ability to turn off polyfills generating

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

@@ -267,6 +267,12 @@ class K2JSCompilerArguments : CommonCompilerArguments() {
     )
     var generateDts: Boolean by FreezableVar(false)
 
+    @Argument(
+        value = "-Xgenerate-polyfills",
+        description = "Generate polyfills for features from the ES6+ standards."
+    )
+    var generatePolyfills: Boolean by FreezableVar(true)
+
     @Argument(
         value = "-Xstrict-implicit-export-types",
         description = "Generate strict types for implicitly exported entities inside d.ts files. Available in IR backend only."

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

@@ -228,6 +228,7 @@ 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_POLYFILLS, arguments.generatePolyfills)
         configurationJs.put(JSConfigurationKeys.GENERATE_INLINE_ANONYMOUS_FUNCTIONS, arguments.irGenerateInlineAnonymousFunctions)
 
         if (!checkKotlinPackageUsage(environmentForJS.configuration, sourcesFiles)) return COMPILATION_ERROR