[Commonizer] Rename: CirTreeMergerV2 -> CirTreeMerger

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/facade.kt

@@ -11,7 +11,7 @@ import org.jetbrains.kotlin.descriptors.commonizer.ResultsConsumer.Status
 import org.jetbrains.kotlin.descriptors.commonizer.core.CommonizationVisitor
 import org.jetbrains.kotlin.descriptors.commonizer.mergedtree.*
 import org.jetbrains.kotlin.descriptors.commonizer.mergedtree.CirNode.Companion.dimension
-import org.jetbrains.kotlin.descriptors.commonizer.mergedtree.CirTreeMergerV2.CirTreeMergeResult
+import org.jetbrains.kotlin.descriptors.commonizer.mergedtree.CirTreeMerger.CirTreeMergeResult
 import org.jetbrains.kotlin.descriptors.commonizer.metadata.MetadataBuilder
 import org.jetbrains.kotlin.library.SerializedMetadata
 import org.jetbrains.kotlin.storage.LockBasedStorageManager
@@ -46,7 +46,7 @@ private fun mergeAndCommonize(storageManager: StorageManager, parameters: Common
             CirProvidedClassifiers.by(parameters.dependencyModulesProvider)
         )
     )
-    val mergeResult = CirTreeMergerV2(storageManager, classifiers, parameters).build()
+    val mergeResult = CirTreeMerger(storageManager, classifiers, parameters).build()
 
     // commonize:
     val mergedTree = mergeResult.root

native/commonizer/src/org/jetbrains/kotlin/descriptors/commonizer/mergedtree/CirTreeMerger.kt

@@ -49,7 +49,7 @@ import org.jetbrains.kotlin.storage.StorageManager
  * targets (which is not supported yet), or a Native library where one fragment is produced via C-interop tool and the other one
  * is compiled from Kotlin/Native source code (not sure this should be supported at all).
  */
-class CirTreeMergerV2(
+class CirTreeMerger(
     private val storageManager: StorageManager,
     private val classifiers: CirKnownClassifiers,
     private val parameters: CommonizerParameters