Basics: add a stub for centralized configurations for block list

lib/Basic/BlockList.cpp

@@ -0,0 +1,41 @@
+//===--- BlockList.cpp - BlockList utilities ------------------------------===//
+//
+// This source file is part of the Swift.org open source project
+//
+// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See https://swift.org/LICENSE.txt for license information
+// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+//
+//===----------------------------------------------------------------------===//
+
+#include "swift/Basic/BlockList.h"
+
+struct swift::BlockListStore::Implementation {
+  void addConfigureFilePath(StringRef path);
+  bool hasBlockListAction(StringRef key, BlockListKeyKind keyKind,
+                          BlockListAction action);
+};
+
+swift::BlockListStore::BlockListStore(): Impl(*new Implementation()) {}
+
+swift::BlockListStore::~BlockListStore() { delete &Impl; }
+
+bool swift::BlockListStore::hasBlockListAction(StringRef key,
+    BlockListKeyKind keyKind, BlockListAction action) {
+  return Impl.hasBlockListAction(key, keyKind, action);
+}
+
+void swift::BlockListStore::addConfigureFilePath(StringRef path) {
+  Impl.addConfigureFilePath(path);
+}
+
+bool swift::BlockListStore::Implementation::hasBlockListAction(StringRef key,
+    BlockListKeyKind keyKind, BlockListAction action) {
+  return false;
+}
+
+void swift::BlockListStore::Implementation::addConfigureFilePath(StringRef path) {
+
+}