Cleanup: apply "Convert lambda to reference"

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

@@ -50,7 +50,7 @@ object PluginCliParser {
             configuration: CompilerConfiguration,
             classLoader: ClassLoader
     ) {
-        val optionValuesByPlugin = arguments.pluginOptions?.map { parsePluginOption(it) }?.groupBy {
+        val optionValuesByPlugin = arguments.pluginOptions?.map(::parsePluginOption)?.groupBy {
             if (it == null) throw CliOptionProcessingException("Wrong plugin option format: $it, should be ${CommonCompilerArguments.PLUGIN_OPTION_FORMAT}")
             it.pluginId
         } ?: mapOf()

compiler/cli/src/org/jetbrains/kotlin/cli/jvm/repl/ReplFromTerminal.kt

@@ -142,7 +142,7 @@ class ReplFromTerminal(
 
     companion object {
         private fun splitCommand(command: String): List<String> {
-            return Arrays.asList(*command.split(" ".toRegex()).dropLastWhile { it.isEmpty() }.toTypedArray())
+            return Arrays.asList(*command.split(" ".toRegex()).dropLastWhile(String::isEmpty).toTypedArray())
         }
 
         fun run(disposable: Disposable, configuration: CompilerConfiguration) {