Flaky crash of service/next_through_new_test on cross-vm-linux-release-arm64

[sstrickl]

We got a segmentation fault during a call to Class:LookupFunction. Here's the crash stack trace:

** Launching SERVICE_TEST_TESTEE=true out/ReleaseXARM64/dart -DDART_SERVICE_USE_AUTH=false --pause-isolates-on-start --pause-isolates-on-exit --profiler --ignore-unrecognized-flags --packages=/b/s/w/ir/.packages --enable-vm-service:0 /b/s/w/ir/runtime/observatory/tests/service/next_through_new_test.dart
** Signaled to run test queries on http://127.0.0.1:45444/
>testee>out> Observatory listening on http://127.0.0.1:45444/
Loading VM...
Done loading VM
>testee>err> 
>testee>err> ===== CRASH =====
>testee>err> version=2.2.0-edge.d9ac2704f852895fdf7bbc8910b6f5f337c0a0da (Fri Jan 4 22:36:28 2019 +0000) on "linux_arm64"
>testee>err> si_signo=Segmentation fault(11), si_code=1, si_addr=0x17
>testee>err> thread=33760, isolate=kernel-service(0xaaaae4d5e400)
>testee>err>   [0x0000aaaac2e244d8] dart::Class::LookupFunction(dart::String const&, dart::Class::MemberKind) const
>testee>err>   [0x0000aaaac2e244d8] dart::Class::LookupFunction(dart::String const&, dart::Class::MemberKind) const
>testee>err>   [0x0000aaaac2ee1c50] dart::Resolver::ResolveDynamicAnyArgs(dart::Zone*, dart::Class const&, dart::String const&, bool)
>testee>err>   [0x0000aaaac2ee174c] dart::Resolver::ResolveDynamicForReceiverClass(dart::Class const&, dart::String const&, dart::ArgumentsDescriptor const&, bool)
>testee>err>   [0x0000aaaac2f6c37c] dart::FlowGraphCompiler::LookupMethodFor(int, dart::String const&, dart::ArgumentsDescriptor const&, dart::Function*, bool*)
>testee>err>   [0x0000aaaac2f7e244] dart::CallTargets::CreateAndExpand(dart::Zone*, dart::ICData const&)
>testee>err>   [0x0000aaaac304bcf8] dart::JitCallSpecializer::VisitInstanceCall(dart::InstanceCallInstr*)
>testee>err>   [0x0000aaaac2f763bc] dart::FlowGraphVisitor::VisitBlocks()
>testee>err>   [0x0000aaaac2f9ebf8] Unknown symbol
>testee>err>   [0x0000aaaac2fa8c84] Unknown symbol
>testee>err>   [0x0000aaaac2fa4728] Unknown symbol
>testee>err>   [0x0000aaaac2fa4354] dart::FlowGraphInliner::Inline()
>testee>err>   [0x0000aaaac2fe2ae8] Unknown symbol
>testee>err>   [0x0000aaaac2fe25a4] dart::CompilerPass::Run(dart::CompilerPassState*) const
>testee>err>   [0x0000aaaac2fe286c] dart::CompilerPass::RunPipeline(dart::CompilerPass::PipelineMode, dart::CompilerPassState*)
>testee>err>   [0x0000aaaac3048060] dart::CompileParsedFunctionHelper::Compile(dart::CompilationPipeline*)
>testee>err>   [0x0000aaaac30489d0] Unknown symbol
>testee>err>   [0x0000aaaac3049738] dart::Compiler::CompileOptimizedFunction(dart::Thread*, dart::Function const&, long)
>testee>err>   [0x0000aaaac304ae58] dart::BackgroundCompiler::Run()
>testee>err>   [0x0000aaaac2f2b194] dart::ThreadPool::Worker::Loop()
>testee>err>   [0x0000aaaac2f2afcc] dart::ThreadPool::Worker::Main(unsigned long)
>testee>err>   [0x0000aaaac2e94880] Unknown symbol
>testee>err>   [0x0000ffffb4b90fc4] Unknown symbol
>testee>err> -- End of DumpStackTrace

This only happened once over the weekend, so looks like it's likely not very reproducable on demand. Full logs here.