[FIR] Replace PersistentList with MutableList in BodyResolveContext, LocalClassesNavigation

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/BodyResolveContext.kt

@@ -73,7 +73,7 @@ class BodyResolveContext(
         get() = towerDataContextsForClassParts.towerDataContextForCallableReferences
 
     @set:PrivateForInline
-    var containers: PersistentList<FirDeclaration> = persistentListOf()
+    var containers: MutableList<FirDeclaration> = mutableListOf()
 
     @set:PrivateForInline
     var containingClass: FirRegularClass? = null
@@ -108,25 +108,23 @@ class BodyResolveContext(
 
     @PrivateForInline
     inline fun <T> withContainer(declaration: FirDeclaration, f: () -> T): T {
-        val oldContainers = containers
-        containers = containers.add(declaration)
+        containers.add(declaration)
         return try {
             f()
         } finally {
-            containers = oldContainers
+            containers.removeAt(containers.size - 1)
         }
     }
 
     @PrivateForInline
     private inline fun <T> withContainerClass(declaration: FirRegularClass, f: () -> T): T {
-        val oldContainers = containers
         val oldContainingClass = containingClass
-        containers = containers.add(declaration)
+        containers.add(declaration)
         containingClass = declaration
         return try {
             f()
         } finally {
-            containers = oldContainers
+            containers.removeAt(containers.size - 1)
             containingClass = oldContainingClass
         }
     }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/LocalClassesNavigation.kt

@@ -49,7 +49,7 @@ private class NavigationInfoVisitor : FirDefaultVisitor<Unit, Any?>() {
     val resultingMap: MutableMap<FirCallableMemberDeclaration<*>, FirClassLikeDeclaration<*>> = mutableMapOf()
     val parentForClass: MutableMap<FirClassLikeDeclaration<*>, FirClassLikeDeclaration<*>?> = mutableMapOf()
     val allMembers: MutableList<FirSymbolOwner<*>> = mutableListOf()
-    private var currentPath: PersistentList<FirClassLikeDeclaration<*>> = persistentListOf()
+    private val currentPath: MutableList<FirClassLikeDeclaration<*>> = mutableListOf()
 
     override fun visitElement(element: FirElement, data: Any?) {}
 
@@ -63,12 +63,11 @@ private class NavigationInfoVisitor : FirDefaultVisitor<Unit, Any?>() {
 
     override fun <F : FirClass<F>> visitClass(klass: FirClass<F>, data: Any?) {
         parentForClass[klass] = currentPath.lastOrNull()
-        val prev = currentPath
-        currentPath = currentPath.add(klass)
+        currentPath.add(klass)
 
         klass.acceptChildren(this, null)
 
-        currentPath = prev
+        currentPath.removeAt(currentPath.size - 1)
     }
 
     override fun visitSimpleFunction(simpleFunction: FirSimpleFunction, data: Any?) {