Mjsunit/debug-script test fails intermittendly with --vector-stores

test/mjsunit/debug-script.js

Index: test/mjsunit/debug-script.js
diff --git a/test/mjsunit/debug-script.js b/test/mjsunit/debug-script.js
index 32415c24287b2264a5b5f678a523e76bbc49d2a8..276fd55e90e9b42f40ca4976c8d93ea744e4b4d5 100644
--- a/test/mjsunit/debug-script.js
+++ b/test/mjsunit/debug-script.js
@@ -28,6 +28,11 @@
 // Flags: --expose-debug-as debug --expose-gc --send-idle-notification
 // Flags: --allow-natives-syntax --expose-natives-as natives
 // Flags: --noharmony-shipping
+// Flags: --nostress-opt
+
+// --nostress-opt is specified because in stress mode the compilation cache
+// may hold on to old copies of scripts (see bug 1641).
+
 // Note: this test checks that that the number of scripts reported as native
 // by Debug.scripts() is the same as a number of core native scripts.
 // Native scripts that are added by --harmony-shipping are classified