Kotlin: fix 2.4 registrar build regression

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: andersfugmann

java/kotlin-extractor/src/main/kotlin/utils/versions/v_2_4_0/Kotlin2ComponentRegistrar.kt

@@ -1,16 +1,16 @@
 package com.github.codeql
 
 import com.intellij.mock.MockProject
-import com.intellij.openapi.extensions.LoadingOrder
 import org.jetbrains.kotlin.backend.common.extensions.IrGenerationExtension
-import org.jetbrains.kotlin.compiler.plugin.ComponentRegistrar
 import org.jetbrains.kotlin.compiler.plugin.CompilerPluginRegistrar
 import org.jetbrains.kotlin.compiler.plugin.ExperimentalCompilerApi
 import org.jetbrains.kotlin.config.CompilerConfiguration
 
 @OptIn(ExperimentalCompilerApi::class)
 @Suppress("DEPRECATION", "DEPRECATION_ERROR")
-abstract class Kotlin2ComponentRegistrar : CompilerPluginRegistrar(), ComponentRegistrar {
+abstract class Kotlin2ComponentRegistrar :
+    CompilerPluginRegistrar(),
+    org.jetbrains.kotlin.compiler.plugin.ComponentRegistrar {
     override val supportsK2: Boolean
         get() = true
 
@@ -22,11 +22,10 @@ abstract class Kotlin2ComponentRegistrar : CompilerPluginRegistrar(), ComponentR
         project: MockProject,
         configuration: CompilerConfiguration
     ) {
-        this.project = project
-        doRegisterExtensions(configuration)
+        // Registration is done via ExtensionStorage in Kotlin 2.4+.
+        // This legacy entry point remains for compatibility with service discovery.
     }
 
-    private var project: MockProject? = null
     private var extensionStorage: CompilerPluginRegistrar.ExtensionStorage? = null
 
     override fun ExtensionStorage.registerExtensions(configuration: CompilerConfiguration) {
@@ -37,15 +36,10 @@ abstract class Kotlin2ComponentRegistrar : CompilerPluginRegistrar(), ComponentR
     abstract fun doRegisterExtensions(configuration: CompilerConfiguration)
 
     protected fun registerExtractorExtension(extension: IrGenerationExtension) {
-        extensionStorage?.let { storage ->
-            with(storage) {
-                IrGenerationExtension.registerExtension(extension)
-            }
-            return
+        val storage = extensionStorage
+            ?: throw IllegalStateException("registerExtractorExtension called before registerExtensions")
+        with(storage) {
+            IrGenerationExtension.registerExtension(extension)
         }
-        // Fallback for ComponentRegistrar-based registration to keep legacy ordering semantics.
-        val p = project ?: throw IllegalStateException("registerExtractorExtension called before registration")
-        val extensionPoint = p.extensionArea.getExtensionPoint(IrGenerationExtension.extensionPointName)
-        extensionPoint.registerExtension(extension, LoadingOrder.LAST, p)
     }
 }