Reland of "[platform] Change default platform max thread pool size 4 -> 8"

test/cctest/cctest.status

 # Copyright 2011 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
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@@ skipping 54 matching lines @@
 
   # This tests only the type system, no point in running several variants.
   'test-hydrogen-types/*': [PASS, NO_VARIANTS],
   'test-types/*': [PASS, NO_VARIANTS],
 
   # This tests API threading, no point in running several variants.
   'test-api/Threading*': [PASS, NO_VARIANTS],
 
   # BUG(2999). The cpu profiler tests are notoriously flaky.
   'test-cpu-profiler/CpuProfileDeepStack': [SKIP],
+  'test-cpu-profiler/CollectCpuProfile': [SKIP],
   'test-cpu-profiler/HotDeoptNoFrameEntry': [SKIP],
   'test-cpu-profiler/SampleWhenFrameIsNotSetup': [SKIP],
 
   # BUG(3525). Test crashes flakily.
   'test-debug/RecursiveBreakpoints': [PASS, FLAKY],
   'test-debug/RecursiveBreakpointsGlobal': [PASS, FLAKY],
 
   # BUG(v8:4358). Hangs flakily.
   'test-debug/ProcessDebugMessagesThreaded': [SKIP],
 
@@ skipping 470 matching lines @@
 
   # TODO(mythria,4680): Incorrect column number on eval.
   'test-api/PromiseRejectCallback': [FAIL],
 
   # TODO(rmcilroy,4680): Test assert errors.
   'test-run-inlining/InlineTwice': [FAIL],
 
 }],  # ignition == True
 
 ]