Some V8 tests fail on github hosted runners

[qinsoon]

See https://github.com/mmtk/mmtk-v8/pull/41/checks?check_run_id=3866176898.

Some tests failed with the following output:

[75:06|%  35|+ 6825|-   1]: cctest/test-concurrent-shared-function-info/Tes...
                                                                              
=== cctest/test-concurrent-shared-function-info/TestConcurrentSharedFunctionInfo ===
New Isolate: 564d16830f60
[2021-10-12T06:56:42Z INFO  mmtk::memory_manager] Initialized MMTk with NoGC


#
# Fatal error in ../../src/heap/heap-inl.h, line 610
# Debug check failed: top <= limit (8097875045981516645 vs. 1852400175).
#
#
#
#FailureMessage Object: 0x7f6e3caddde0
==== C stack trace ===============================

    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_libbase.so(v8::base::debug::StackTrace::StackTrace()+0x13) [0x7f6e57c14b63]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_libplatform.so(+0x1c00d) [0x7f6e57c3700d]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_libbase.so(V8_Fatal(char const*, int, char const*, ...)+0x153) [0x7f6e57c07463]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_libbase.so(+0x20ee5) [0x7f6e57c06ee5]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/cctest(v8::internal::Heap::IsPendingAllocation(v8::internal::HeapObject)+0x142) [0x564d13c04652]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::JSHeapBroker::TryGetOrCreateData(v8::internal::Handle<v8::internal::Object>, v8::base::Flags<v8::internal::compiler::GetOrCreateDataFlag, int>)+0x18c) [0x7f6e569c9ccc]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::base::Optional<v8::internal::compiler::ref_traits<v8::internal::BytecodeArray>::ref_type> v8::internal::compiler::TryMakeRef<v8::internal::BytecodeArray, void>(v8::internal::compiler::JSHeapBroker*, v8::internal::BytecodeArray, v8::base::Flags<v8::internal::compiler::GetOrCreateDataFlag, int>)+0x2a) [0x7f6e56a0da3a]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::SharedFunctionInfoRef::GetBytecodeArray() const+0xb5) [0x7f6e569f3b05]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::BytecodeGraphBuilder::BytecodeGraphBuilder(v8::internal::compiler::JSHeapBroker*, v8::internal::Zone*, v8::internal::compiler::NativeContextRef const&, v8::internal::compiler::SharedFunctionInfoRef const&, v8::internal::compiler::FeedbackCellRef const&, v8::internal::BytecodeOffset, v8::internal::compiler::JSGraph*, v8::internal::compiler::CallFrequency const&, v8::internal::compiler::SourcePositionTable*, int, v8::internal::CodeKind, v8::base::Flags<v8::internal::compiler::BytecodeGraphBuilderFlag, int>, v8::internal::TickCounter*, v8::internal::compiler::ObserveNodeInfo const&)+0x6c) [0x7f6e56916b6c]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::BuildGraphFromBytecode(v8::internal::compiler::JSHeapBroker*, v8::internal::Zone*, v8::internal::compiler::SharedFunctionInfoRef const&, v8::internal::compiler::FeedbackCellRef const&, v8::internal::BytecodeOffset, v8::internal::compiler::JSGraph*, v8::internal::compiler::CallFrequency const&, v8::internal::compiler::SourcePositionTable*, int, v8::internal::CodeKind, v8::base::Flags<v8::internal::compiler::BytecodeGraphBuilderFlag, int>, v8::internal::TickCounter*, v8::internal::compiler::ObserveNodeInfo const&)+0x122) [0x7f6e5692b2b2]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::GraphBuilderPhase::Run(v8::internal::compiler::PipelineData*, v8::internal::Zone*)+0x12c) [0x7f6e56b37fbc]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(void v8::internal::compiler::PipelineImpl::Run<v8::internal::compiler::GraphBuilderPhase>()+0x8a) [0x7f6e56b2af4a]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::PipelineImpl::CreateGraph()+0x4e) [0x7f6e56b26cce]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::compiler::PipelineCompilationJob::ExecuteJobImpl(v8::internal::RuntimeCallStats*, v8::internal::LocalIsolate*)+0x61) [0x7f6e56b26f11]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_for_testing.so(v8::internal::OptimizedCompilationJob::ExecuteJob(v8::internal::RuntimeCallStats*, v8::internal::LocalIsolate*)+0x7f) [0x7f6e55b4f61f]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/cctest(v8::internal::compiler::BackgroundCompilationThread::Run()+0xb4) [0x564d13a84024]
    /home/runner/work/mmtk-v8/mmtk-v8/v8_deps/v8/out/x64.optdebug-mmtk/libv8_libbase.so(+0x2d4b0) [0x7f6e57c134b0]
    /lib/x86_64-linux-gnu/libpthread.so.0(+0x76db) [0x7f6e53e496db]
    /lib/x86_64-linux-gnu/libc.so.6(clone+0x3f) [0x7f6e537d471f]
Aborted (core dumped)
Command: out/x64.optdebug-mmtk/cctest test-concurrent-shared-function-info/TestConcurrentSharedFunctionInfo --random-seed=1158212576 --nohard-abort --enable-slow-asserts --verify-heap --testing-d8-test-runner
--- FAILED ---