[turbofan] Disable test

This CL disables a test that takes too long in debug mode when
escape analysis is enabled in turbofan.

R=machenbach@chromium.org
BUG=v8:4586
LOG=n
NOTRY=true

Review URL: https://codereview.chromium.org/1636593004

Cr-Commit-Position: refs/heads/master@{#33514}

test/mjsunit/mjsunit.status

@@ -279,7 +279,7 @@
   'es7/object-observe': [PASS, ['mode == debug', SLOW]],
   'numops-fuzz-part*': [PASS, ['mode == debug', SLOW]],
   'readonly': [PASS, SLOW],
-  'regress/regress-1200351': [PASS, ['mode == debug', SLOW]],
+  'regress/regress-1200351': [PASS, ['mode == debug', SLOW, NO_VARIANTS]],
   'regress/regress-crbug-474297': [PASS, ['mode == debug', SLOW]],
   'strong/implicit-conversions': [PASS, SLOW],
   'strong/load-element-mutate-backing-store': [PASS, SLOW],