Version 5.7.324.1 (cherry-pick)

src/debug/debug.js

Index: src/debug/debug.js
diff --git a/src/debug/debug.js b/src/debug/debug.js
index beefb971622fd49392a6889061261d72d4df3d5e..7c38b7e6dd77bf4bfd303a15b5691479d28f2224 100644
--- a/src/debug/debug.js
+++ b/src/debug/debug.js
@@ -435,7 +435,7 @@ Debug.setListener = function(listener, opt_data) {
 Debug.findScript = function(func_or_script_name) {
   if (IS_FUNCTION(func_or_script_name)) {
     return %FunctionGetScript(func_or_script_name);
-  } else if (%IsRegExp(func_or_script_name)) {
+  } else if (IS_REGEXP(func_or_script_name)) {
     var scripts = this.scripts();
     var last_result = null;
     var result_count = 0;