[turbofan] Disable two more failing tests.

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 135 matching lines @@
   # issue 4055:
   'es6/generators-debug-scopes': [PASS, NO_VARIANTS],
 
   # TODO(titzer): --always-opt incorrectly disables CrankShaft soft deopt points
   'result-table-min': [PASS, NO_VARIANTS],
   'result-table-max': [PASS, NO_VARIANTS],
   # TODO(titzer): too slow in --turbo mode due to O(n^2) graph verification.
   'regress/regress-1122': [PASS, NO_VARIANTS],
 
   # Issue 4493: Bugs due to --turbo-inlining.
+  'sparse-array-reverse': [PASS, NO_VARIANTS],
   'harmony/reflect': [PASS, NO_VARIANTS],
 
   # Assumptions about optimization need investigation in TurboFan.
   'compiler/inlined-call': [PASS, NO_VARIANTS],
   'deopt-with-fp-regs': [PASS, NO_VARIANTS],
   'regress-sync-optimized-lists': [PASS, NO_VARIANTS],
 
   # TODO(bmeurer/jarin): Crash in code generator?
   'constant-folding-2': [PASS, NO_VARIANTS],
 
@@ skipping 103 matching lines @@
   'harmony/rest-params': [PASS, ['no_snap == True', NO_VARIANTS]],
 
   # Slow tests.
   'copy-on-write-assert': [PASS, SLOW],
   'debug-scopes': [PASS, SLOW],
   'es7/object-observe': [PASS, ['mode == debug', SLOW]],
   'numops-fuzz-part*': [PASS, ['mode == debug', SLOW]],
   'readonly': [PASS, SLOW],
   'regress/regress-1200351': [PASS, ['mode == debug', SLOW]],
   'regress/regress-crbug-474297': [PASS, ['mode == debug', SLOW]],
-  'strong/implicit-conversions': [PASS, SLOW],
+  # Issue 4493: The 'implicit-conversions' is only NO_VARIANTS because of 4493.
+  'strong/implicit-conversions': [PASS, SLOW, NO_VARIANTS],
   'strong/load-element-mutate-backing-store': [PASS, SLOW],
 }],  # ALWAYS
 
 ['novfp3 == True', {
   'asm/embenchen/box2d': [SKIP],
   'asm/embenchen/zlib': [SKIP],
   'asm/embenchen/memops': [SKIP],
   'asm/embenchen/lua_binarytrees': [SKIP],
 }],  # novfp3 == True
 
@@ skipping 435 matching lines @@
   'd8-worker-sharedarraybuffer': [SKIP],
 }],  # 'predictable == True'
 
 ##############################################################################
 ['arch == ppc and simulator_run == True or arch == ppc64 and simulator_run == True', {
 
   # take too long with the simulator.
   'regress/regress-1132': [SKIP],
 }],  # 'arch == ppc and simulator_run == True'
 ]