__google_stl_debug_vector: erase() at invalid position: folly/experimental/test:futur...

__google_stl_debug_vector: erase() at invalid position: folly/experimental/test:future_dag_test - FutureDAGTest.RemoveNodeComplex

Summary:
```
[ RUN      ] FutureDAGTest.RemoveNodeComplex
terminate called after throwing an instance of 'std::out_of_range'
  what():  erase() at invalid position
*** Aborted at 1470867850 (Unix time, try 'date -d 1470867850') ***
*** Signal 6 (SIGABRT) (0x133c001ed107) received by PID 2019591 (pthread TID 0x7ff1e6df5980) (linux TID 2019591) (maybe from PID 2019591, UID 4924), stack trace: ***
    @ 00007ff1e702020f folly::symbolizer::(anonymous namespace)::innerSignalHandler(int, siginfo_t*, void*)
    @ 00007ff1e701faf1 folly::symbolizer::(anonymous namespace)::signalHandler(int, siginfo_t*, void*)
    @ 00007ff1e87c714f (unknown)
    @ 00007ff1e7cf6d02 gsignal
    @ 00007ff1e7cf8af5 abort
    @ 00007ff1e73880e4 __gnu_cxx::__verbose_terminate_handler()
    @ 00007ff1e7385ee5 __cxxabiv1::__terminate(void (*)())
    @ 00007ff1e7385f30 std::terminate()
    @ 00007ff1e73861c0 __cxa_throw
    @ 00007ff1e740ae00 std::__throw_out_of_range(char const*)
    @ 00000000004483db std::vector<folly::FutureDAG::Node, std::allocator<folly::FutureDAG::Node> >::_M_erase(__gnu_cxx::__normal_iterator<folly::FutureDAG::Node*, std::vector<folly::FutureDAG::Node, std::allocator<folly::FutureDAG::Node> > >)
    @ 00000000004478fa std::vector<folly::FutureDAG::Node, std::allocator<folly::FutureDAG::Node> >::erase(__gnu_cxx::__normal_iterator<folly::FutureDAG::Node const*, std::vector<folly::FutureDAG::Node, std::allocator<folly::FutureDAG::Node> > >)
    @ 000000000044770a folly::FutureDAG::remove(unsigned long)
    @ 0000000000424bc2 FutureDAGTest::remove(unsigned long)
    @ 000000000041f7ed FutureDAGTest_RemoveNodeComplex_Test::TestBody()
    @ 00007ff1e9b19361 void testing::internal::HandleExceptionsInMethodIfSupported<testing::Test, void>(testing::Test*, void (testing::Test::*)(), char const*)
                       /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest.cc:2420
                       -> /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest-all.cc
    @ 00007ff1e9b029de testing::Test::Run()
                       /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest.cc:2437
                       -> /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest-all.cc
    @ 00007ff1e9b02aca testing::TestInfo::Run()
                       /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest.cc:2612
                       -> /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest-all.cc
    @ 00007ff1e9b02cfc testing::TestCase::Run()
                       /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest.cc:2730
                       -> /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest-all.cc
    @ 00007ff1e9b0d2a7 testing::internal::UnitTestImpl::RunAllTests()
                       /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest.cc:4602
                       -> /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest-all.cc
    @ 00007ff1e9b0d60c testing::UnitTest::Run()
                       /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest.cc:2420
                       -> /home/engshare/third-party2/gtest/1.7.0/src/gtest-1.7.0/src/gtest-all.cc
    @ 00007ff1eb64ec70 RUN_ALL_TESTS()
    @ 00007ff1eb64ec3c main
    @ 00007ff1e7ce10f5 __libc_start_main
    @ 000000000041f2d2 (unknown)
Summary (total time 0.07s):
  PASS: 0
  FAIL: 0
  SKIP: 0
  FATAL: 1
    folly/experimental/test:future_dag_test - FutureDAGTest.RemoveNodeComplex
  TIMEOUT: 0
````

Reviewed By: yfeldblum

Differential Revision: D3700956

fbshipit-source-id: dffca9460ccca1d8069218c5b7310e4d6e061697