[test] Skip tests unsuitable for gc fuzzing

Those tests were wrongly reenabled in:
https://crrev.com/c/1565892

They don't fail assertOptimized, but other GC sensitive assertions.

TBR=sergiyb@chromium.org
NOTRY=true

Bug: v8:9127
Change-Id: Ic1f7838dca5c2e6917f245d84e6c1e0b9414396d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1569426Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#60859}

test/mjsunit/mjsunit.status

@@ -810,6 +810,11 @@
   # Fails allocation on tsan.
   'es6/classes': [PASS, ['tsan', SKIP]],
   'regress/regress-779407': [PASS, ['tsan', SKIP]],
+
+  # Tests that fail some assertions due to checking internal state sensitive
+  # to GC.
+  'compiler/native-context-specialization-hole-check': [SKIP],
+  'shared-function-tier-up-turbo': [SKIP],
 }],  # 'gc_fuzzer'
 
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