[test] Skip memory-hungry test for gc fuzzer with tsan

TBR=majeski@google.com
NOTRY=true

Bug: v8:6972
Change-Id: I80f392c97e4120dc81745346b36f9c505da13461
Reviewed-on: https://chromium-review.googlesource.com/822410Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50027}

test/mjsunit/mjsunit.status

@@ -630,6 +630,7 @@
   'regress/regress-336820': [SKIP],
   'regress/regress-748069': [SKIP],
   'regress/regress-778668': [SKIP],
+  'ignition/regress-672027': [PASS, ['tsan', SKIP]],
 }],  # 'gc_fuzzer == True'
 
 ##############################################################################