[Commonizer] Minor. Extract common module names from CommonizerParameters

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

@@ -38,14 +38,17 @@ class CommonizerParameters(
             _resultsConsumer = value
         }
 
-    fun hasAnythingToCommonize(): Boolean {
-        if (_targetProviders.size < 2) return false // too few targets
+    fun getCommonModuleNames(): Set<String> {
+        if (_targetProviders.size < 2) return emptySet() // too few targets
 
         val allModuleNames: List<Set<String>> = _targetProviders.values.map { targetProvider ->
             targetProvider.modulesProvider.loadModuleInfos().mapTo(HashSet()) { it.name }
         }
-        val commonModuleNames: Set<String> = allModuleNames.reduce { a, b -> a intersect b }
 
-        return commonModuleNames.isNotEmpty() // there are modules that are present in every target
+        return allModuleNames.reduce { a, b -> a intersect b } // there are modules that are present in every target
+    }
+
+    fun hasAnythingToCommonize(): Boolean {
+        return getCommonModuleNames().isNotEmpty()
     }
 }

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

@@ -74,7 +74,7 @@ class CirTreeMerger(
         val allModuleInfos: List<Map<String, ModuleInfo>> = parameters.targetProviders.map { targetProvider ->
             targetProvider.modulesProvider.loadModuleInfos().associateBy { it.name }
         }
-        val commonModuleNames = allModuleInfos.map { it.keys }.reduce { a, b -> a intersect b }
+        val commonModuleNames = parameters.getCommonModuleNames()
 
         parameters.targetProviders.forEachIndexed { targetIndex, targetProvider ->
             val commonModuleInfos = allModuleInfos[targetIndex].filterKeys { it in commonModuleNames }
@@ -127,7 +127,7 @@ class CirTreeMerger(
         val moduleNode: CirModuleNode = rootNode.modules.getOrPut(moduleName) {
             buildModuleNode(storageManager, size)
         }
-        moduleNode.targetDeclarations[targetIndex] = CirModuleFactory.create(moduleDescriptor)
+        moduleNode.targetDeclarations[targetIndex] = CirModuleFactory.create(moduleName)
 
         moduleDescriptor.collectNonEmptyPackageMemberScopes { packageFqName, packageMemberScope ->
             processPackage(moduleNode, targetIndex, packageFqName.intern(), packageMemberScope)