[test] Skip some tests on the coverage bot.

test/mjsunit/mjsunit.status

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # 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
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 1047 matching lines @@
   'regress/regress-91008': [SKIP],
   'regress/regress-crbug-347903': [SKIP],
   'regress/regress-crbug-505007-1': [SKIP],
   'regress/regress-crbug-505007-2': [SKIP],
   'regress/short-circuit': [SKIP],
   'stack-traces-overflow': [SKIP],
   'unicodelctest': [SKIP],
   'unicodelctest-no-optimization': [SKIP],
 }],  # ignition == True and (arch == arm or arch == arm64)
 
+##############################################################################
+['gcov_coverage', {
+  # Tests taking too long.
+  'array-functions-prototype-misc': [SKIP],
+  'strong/implicit-conversions': [SKIP],
+  'strong/load-element-mutate-backing-store': [SKIP],
+}],  # 'gcov_coverage'
+
 ]