JVM IR: fix another naming inconsistency with old backend

This fixes slice rewrite stacktraces from RecordNamesForKotlinTypeMapper
which are printed out when running some JVM IR tests (even though
they're ignored), e.g. localClassSimpleName.kt

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/lower/InventNamesForLocalClasses.kt

@@ -107,6 +107,12 @@ class InventNamesForLocalClasses(private val context: JvmBackendContext) : FileL
                         localFunctionNames[(declaration as IrFunction).symbol] = name
                     }
                 }
+                declaration is IrFunction && declaration.parent !is IrClass -> {
+                    // In the old backend, only names of non-local functions are stored in names of anonymous classes. All other names
+                    // are replaced with indices. For example, a local class `L` in a top-level function `f` will have the name `...$f$L`,
+                    // but inside a local function `g` (which is in `f`) it will have the name `...$f$1$L` (_not_ `...$f$g$L`).
+                    inventName(null, data)
+                }
                 enclosingName != null -> "$enclosingName$$simpleName"
                 else -> simpleName
             }

compiler/testData/checkLocalVariablesTable/itInReturnedLambda.kt

@@ -1,4 +1,3 @@
-// IGNORE_BACKEND: JVM_IR
 fun foo() {
     fun bar() : (Int) -> Unit {
         return {