[mjsunit] Fix an OSR test

R=machenbach@chromium.org

Bug: v8:10220
Change-Id: I541adfd7d02ecbd68474acaf8e672c1838fc318f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2061551Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66305}

test/mjsunit/compiler/osr-block-scope-id.js

@@ -36,6 +36,7 @@ function check() {
   }
   assertEquals(0, r.length);
 }
+%PrepareFunctionForOptimization(check);
 
 check();
 check();