[Commonizer] Drop CirExtensionReceiver interface for plain data class

native/commonizer/src/org/jetbrains/kotlin/commonizer/cir/CirExtensionReceiver.kt

@@ -5,22 +5,7 @@
 
 package org.jetbrains.kotlin.commonizer.cir
 
-interface CirExtensionReceiver : CirHasAnnotations {
+data class CirExtensionReceiver(
-    val type: CirType
-
-    companion object {
-        @Suppress("NOTHING_TO_INLINE")
-        inline fun create(
-            annotations: List<CirAnnotation>,
-            type: CirType
-        ): CirExtensionReceiver = CirExtensionReceiverImpl(
-            annotations = annotations,
-            type = type
-        )
-    }
-}
-
-data class CirExtensionReceiverImpl(
     override val annotations: List<CirAnnotation>,
-    override val type: CirType
+    val type: CirType
-) : CirExtensionReceiver
+) : CirHasAnnotations

native/commonizer/src/org/jetbrains/kotlin/commonizer/core/ExtensionReceiverCommonizer.kt

@@ -14,7 +14,7 @@ class ExtensionReceiverCommonizer(classifiers: CirKnownClassifiers) :
         wrappedCommonizerFactory = { TypeCommonizer(classifiers).asCommonizer() },
         extractor = { it.type },
         builder = { receiverType ->
-            CirExtensionReceiver.create(
+            CirExtensionReceiver(
                 annotations = emptyList(),
                 type = receiverType
             )

native/commonizer/src/org/jetbrains/kotlin/commonizer/metadata/CirDeserializers.kt

@@ -84,7 +84,7 @@ object CirDeserializers {
     private fun extensionReceiver(
         receiverParameterType: KmType,
         typeResolver: CirTypeResolver
-    ): CirExtensionReceiver = CirExtensionReceiver.create(
+    ): CirExtensionReceiver = CirExtensionReceiver(
         annotations = emptyList(), // TODO nowhere to read receiver annotations from, see KT-42490
         type = type(receiverParameterType, typeResolver)
     )

native/commonizer/tests/org/jetbrains/kotlin/commonizer/core/ExtensionReceiverCommonizerTest.kt

@@ -50,7 +50,7 @@ class ExtensionReceiverCommonizerTest : AbstractCommonizerTest<CirExtensionRecei
     override fun createCommonizer() = ExtensionReceiverCommonizer(MOCK_CLASSIFIERS)
 }
 
-private fun mockExtensionReceiver(receiverClassId: String) = CirExtensionReceiver.create(
+private fun mockExtensionReceiver(receiverClassId: String) = CirExtensionReceiver(
     annotations = emptyList(),
     type = mockClassType(receiverClassId)
 )