[test] Skip slow tests for deopt fuzzer.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
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 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
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@@ skipping 717 matching lines @@
   'array-feedback': [SKIP],
 
   # Bounds check triggers forced deopt for array constructors.
   'array-constructor-feedback': [SKIP],
 
   # Deopting uses just enough memory to make this one OOM.
   'regress/regress-3976': [SKIP],
 
   # Deopt every n garbage collections collides with deopt every n times.
   'regress/regress-2653': [SKIP],
+
+  # Too slow.
+  'es6/tail-call-megatest*': [SKIP],
 }],  # 'deopt_fuzzer == True'
 
 ##############################################################################
 ['predictable == True', {
 
   # Skip tests that are known to be non-deterministic.
   'd8-worker-sharedarraybuffer': [SKIP],
   'd8-os': [SKIP],
 }],  # 'predictable == True'
 
@@ skipping 124 matching lines @@
 ##############################################################################
 ['gcov_coverage', {
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]