[test] Skip some tests on gc fuzzer

NOTRY=true
TBR=yangguo@chromium.org

Change-Id: Ic5e8ea11035ad77d4a47e600283f83941ca5af43
Reviewed-on: https://chromium-review.googlesource.com/1213213Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55735}

test/debugger/debugger.status

@@ -78,6 +78,12 @@
   'debug/side-effect/debug-evaluate-no-side-effect-control': [SKIP],
 }],  # 'gc_stress == True'
 
+##############################################################################
+['gc_fuzzer', {
+  # Slow tests.
+  'regress/regress-2318': [SKIP],
+}],  # 'gc_fuzzer'
+
 ##############################################################################
 ['predictable == True', {
   # https://crbug.com/v8/8147

test/mjsunit/mjsunit.status

@@ -712,6 +712,7 @@
   'keyed-load-with-symbol-key': [PASS, FAIL],
   'object-seal': [PASS, FAIL],
   'regress/regress-3709': [PASS, FAIL],
+  'regress/regress-6948': [PASS, FAIL],
   'regress/regress-7510': [PASS, FAIL],
   'regress/regress-trap-allocation-memento': [PASS, FAIL],
   'regress/regress-unlink-closures-on-deopt': [PASS, FAIL],