Skip crashing harmony mjsunit tests on NaCL

BUG=none
TBR=machenbach@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/219043002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20340 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

test/mjsunit/mjsunit.status

@@ -367,6 +367,10 @@
 
   # Lead to OOM:
   'string-oom-*': [SKIP],
+
+  # Crashes.
+  'harmony/private': [SKIP],
+  'harmony/symbols': [SKIP],
 }],  # 'arch == nacl_ia32 or arch == nacl_x64'
 
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