[Sheriff] Temporarily mark two mjsunit tests as flaky.

The tests are blocking the v8 lkgr. They will be unmarked again after there is infrastructure to disable them on GC stress only.

TBR=mvstanton@chromium.org
BUG=

Review URL: https://codereview.chromium.org/139343008

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18698 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/mjsunit.status

@@ -104,6 +104,11 @@
   # Tests verifying CHECK and ASSERT.
   'verify-check-false': [FAIL, NO_VARIANTS],
   'verify-assert-false': [NO_VARIANTS, ['mode == release', PASS], ['mode == debug', FAIL]],
+
+  # TODO(machenbach): Temporarily marked as flaky until there is infrastructure
+  # to disable these tests on GC stress.
+  'elements-kind': [PASS, ['mode == debug and system == linux', FLAKY]],
+  'osr-elements-kind': [PASS, ['mode == debug and system == linux', FLAKY]],
 }],  # ALWAYS
 
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