FIR IDE: handle importing scopes in completion in HL API

Co-authored-by: Roman Golyshev <roman.golyshev@jetbrains.com>

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/scopes/impl/FirAbstractImportingScope.kt

@@ -1,6 +1,6 @@
 /*
- * Copyright 2010-2019 JetBrains s.r.o. Use of this source code is governed by the Apache 2.0 license
- * that can be found in the license/LICENSE.txt file.
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.fir.scopes.impl
@@ -26,7 +26,7 @@ abstract class FirAbstractImportingScope(
 ) : FirAbstractProviderBasedScope(session, lookupInFir) {
 
     // TODO: Rewrite somehow?
-    private fun getStaticsScope(classId: ClassId): FirScope? {
+    fun getStaticsScope(classId: ClassId): FirScope? {
         val symbol = provider.getClassLikeSymbolByFqName(classId) ?: return null
         if (symbol is FirTypeAliasSymbol) {
             val expansionSymbol = symbol.fir.expandedConeType?.lookupTag?.toSymbol(session)