Change mjsunit tests to work with and without the i18n extension

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 afaa36904285e0b80563fa435843d1b3fa438a96..c456e6bf574fa5533b0ac1a0112f0472e7032aaa 100644
--- a/test/mjsunit/debug-script.js
+++ b/test/mjsunit/debug-script.js
@@ -61,9 +61,8 @@ for (i = 0; i < scripts.length; i++) {
 
 // This has to be updated if the number of native scripts change.
 assertEquals(16, named_native_count);
-// If no snapshot is used, only the 'gc' extension is loaded.
-// If snapshot is used, all extensions are cached in the snapshot.
-assertTrue(extension_count == 1 || extension_count == 5);
+// Only the 'gc' and (depending on flags) the 'i18n' extensions are loaded.
+assertTrue(extension_count == 1 || extension_count == 2);
 // This script and mjsunit.js has been loaded.  If using d8, d8 loads
 // a normal script during startup too.
 assertTrue(normal_count == 2 || normal_count == 3);