Enable test after arguments count limitation was lifted.

R=bmeurer@chromium.org
TEST=mozilla/js1_5/Regress/regress-396684
BUG=v8:3786

Review URL: https://codereview.chromium.org/832713005

Cr-Commit-Position: refs/heads/master@{#26026}

test/mozilla/mozilla.status

@@ -56,7 +56,6 @@
   # TODO(turbofan): These are all covered by mjsunit as well. Enable them once
   # we pass 'mjsunit' and 'webkit' with TurboFan.
   'js1_4/Functions/function-001': [PASS, NO_VARIANTS],
-  'js1_5/Regress/regress-396684': [PASS, NO_VARIANTS],
   'js1_5/Regress/regress-80981': [PASS, NO_VARIANTS],
 
   # TODO(turbofan): Large switch statements crash.