Demangle backtrace symbols on raft error

[achirkin]

Demangle the error stack trace provided by GCC.
Example output:

RAFT failure at file=/workspace/raft/cpp/bench/ann/src/raft/raft_ann_bench_utils.h line=127: Ooops!
Obtained 16 stack frames
#1 in /workspace/raft/cpp/build/libraft_ivf_pq_ann_bench.so: raft::logic_error::logic_error(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&) +0x5e [0x7fb20acce45e]
#2 in /workspace/raft/cpp/build/libraft_ivf_pq_ann_bench.so: raft::bench::ann::configured_raft_resources::stream_wait(CUstream_st*) const +0x2e3 [0x7fb20acd0ac3]
#3 in /workspace/raft/cpp/build/libraft_ivf_pq_ann_bench.so: raft::bench::ann::RaftIvfPQ<float, long>::search(float const*, int, int, unsigned long*, float*, CUstream_st*) const +0x63e [0x7fb20acd44fe]
#4 in ./cpp/build/ANN_BENCH: void raft::bench::ann::bench_search<float>(benchmark::State&, raft::bench::ann::Configuration::Index, unsigned long, std::shared_ptr<raft::bench::ann::Dataset<float> const>, raft::bench::ann::Objective) +0xf76 [0x55853859f586]
#5 in ./cpp/build/ANN_BENCH: benchmark::internal::LambdaBenchmark<benchmark::RegisterBenchmark<void (&)(benchmark::State&, raft::bench::ann::Configuration::Index, unsigned long, std::shared_ptr<raft::bench::ann::Dataset<float> const>, raft::bench::ann::Objective), raft::bench::ann::Configuration::Index&, unsigned long&, std::shared_ptr<raft::bench::ann::Dataset<float> const>&, raft::bench::ann::Objective&>(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > const&, void (&)(benchmark::State&, raft::bench::ann::Configuration::Index, unsigned long, std::shared_ptr<raft::bench::ann::Dataset<float> const>, raft::bench::ann::Objective), raft::bench::ann::Configuration::Index&, unsigned long&, std::shared_ptr<raft::bench::ann::Dataset<float> const>&, raft::bench::ann::Objective&)::{lambda(benchmark::State&)#1}>::Run(benchmark::State&) +0x84 [0x558538548f14]
#6 in ./cpp/build/ANN_BENCH: benchmark::internal::BenchmarkInstance::Run(long, int, benchmark::internal::ThreadTimer*, benchmark::internal::ThreadManager*, benchmark::internal::PerfCountersMeasurement*) const +0x168 [0x5585385d6498]
#7 in ./cpp/build/ANN_BENCH(+0x149108) [0x5585385b7108]
#8 in ./cpp/build/ANN_BENCH: benchmark::internal::BenchmarkRunner::DoNIterations() +0x34f [0x5585385b8c7f]
#9 in ./cpp/build/ANN_BENCH: benchmark::internal::BenchmarkRunner::DoOneRepetition() +0x119 [0x5585385b99b9]
#10 in ./cpp/build/ANN_BENCH(+0x13afdd) [0x5585385a8fdd]
#11 in ./cpp/build/ANN_BENCH: benchmark::RunSpecifiedBenchmarks(benchmark::BenchmarkReporter*, benchmark::BenchmarkReporter*, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >) +0x58e [0x5585385aa8fe]
#12 in ./cpp/build/ANN_BENCH: benchmark::RunSpecifiedBenchmarks() +0x6a [0x5585385aaada]
#13 in ./cpp/build/ANN_BENCH: raft::bench::ann::run_main(int, char**) +0x11ed [0x5585385980cd]
#14 in /lib/x86_64-linux-gnu/libc.so.6(+0x28150) [0x7fb213e28150]
#15 in /lib/x86_64-linux-gnu/libc.so.6: __libc_start_main +0x89 [0x7fb213e28209]
#16 in ./cpp/build/ANN_BENCH(+0xbfcef) [0x55853852dcef]

[tfeher]

LGTM.

[cjnolet]

/merge