[test] Skip slow test for gc fuzzing

TBR=sergiyb@chromium.org
NOTRY=true

Bug: v8:6972
Change-Id: Iada267047a023cf32e49866dbf46f62311a3445c
Reviewed-on: https://chromium-review.googlesource.com/876123
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#50721}

test/benchmarks/benchmarks.status

@@ -36,4 +36,10 @@
   'kraken/imaging-gaussian-blur': [PASS, SLOW],
   'octane/typescript': [PASS, SLOW],
 }],  # ALWAYS
+
+['gc_fuzzer', {
+  # Too slow for gc fuzzing.
+  'octane/splay': [PASS, SLOW, ['tsan', SKIP]],
+  'octane/typescript': [SKIP],
+}],  # 'gc_fuzzer'
 ]

test/mjsunit/mjsunit.status

@@ -634,12 +634,15 @@
 }],  # 'deopt_fuzzer == True'
 
 ##############################################################################
-['gc_fuzzer == True', {
+['gc_fuzzer', {
   'regress/regress-336820': [SKIP],
   'regress/regress-748069': [SKIP],
   'regress/regress-778668': [SKIP],
   'ignition/regress-672027': [PASS, ['tsan', SKIP]],
-}],  # 'gc_fuzzer == True'
+
+  # Fails allocation on tsan.
+  'es6/classes': [PASS, ['tsan', SKIP]],
+}],  # 'gc_fuzzer'
 
 ##############################################################################
 ['predictable == True', {