Added one more suppression for stdc++ lib making helgrind unhappy.

tests/helgrind.suppr

@@ -510,4 +510,21 @@
    fun:_ZNSt12__shared_ptrINSt13__future_base11_State_baseELN9__gnu_cxx12_Lock_policyE2EED1Ev
    fun:_ZNSt10shared_ptrINSt13__future_base11_State_baseEED1Ev
    fun:_ZNSt7promiseIvED1Ev
-}
\ No newline at end of file
+}
+
+{
+   std::thread::_Impl_base::~_Impl_base()
+   Helgrind:Race
+   fun:_ZNSt6thread10_Impl_baseD1Ev
+   fun:_ZNSt6thread5_ImplISt12_Bind_simpleIFZNSt13__future_base17_Async_state_implIS1_IFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS6_RKSsRSt8functionIFSsSA_EEEUlvE_vEEvEC1EOSH_EUlvE_vEEED1Ev
+   fun:_ZN9__gnu_cxx13new_allocatorINSt6thread5_ImplISt12_Bind_simpleIFZNSt13__future_base17_Async_state_implIS3_IFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS8_RKSsRSt8functionIFSsSC_EEEUlvE_vEEvEC1EOSJ_EUlvE_vEEEEE7destroyISP_EEvPT_
+   fun:_ZNSt16allocator_traitsISaINSt6thread5_ImplISt12_Bind_simpleIFZNSt13__future_base17_Async_state_implIS2_IFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS7_RKSsRSt8functionIFSsSB_EEEUlvE_vEEvEC1EOSI_EUlvE_vEEEEEE10_S_destroyISO_EENSt9enable_ifIXsrNSQ_16__destroy_helperIT_EE5valueEvE4typeERSP_PSU_
+   fun:_ZNSt16allocator_traitsISaINSt6thread5_ImplISt12_Bind_simpleIFZNSt13__future_base17_Async_state_implIS2_IFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS7_RKSsRSt8functionIFSsSB_EEEUlvE_vEEvEC1EOSI_EUlvE_vEEEEEE7destroyISO_EEvRSP_PT_
+   fun:_ZNSt23_Sp_counted_ptr_inplaceINSt6thread5_ImplISt12_Bind_simpleIFZNSt13__future_base17_Async_state_implIS2_IFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS7_RKSsRSt8functionIFSsSB_EEEUlvE_vEEvEC1EOSI_EUlvE_vEEEESaISO_ELN9__gnu_cxx12_Lock_policyE2EE10_M_disposeEv
+   fun:_ZNSt16_Sp_counted_baseILN9__gnu_cxx12_Lock_policyE2EE10_M_releaseEv
+   fun:_ZNSt14__shared_countILN9__gnu_cxx12_Lock_policyE2EED1Ev
+   fun:_ZNSt12__shared_ptrINSt6thread10_Impl_baseELN9__gnu_cxx12_Lock_policyE2EED1Ev
+   fun:_ZNSt10shared_ptrINSt6thread10_Impl_baseEED1Ev
+   fun:_ZNSt6threadC1IZNSt13__future_base17_Async_state_implISt12_Bind_simpleIFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS6_RKSsRSt8functionIFSsSA_EEEUlvE_vEEvEC1EOSH_EUlvE_IEEEOT_DpOT0_
+   fun:_ZNSt13__future_base17_Async_state_implISt12_Bind_simpleIFZN3cta11objectstore10BackendVFS12AsyncUpdaterC1ERS4_RKSsRSt8functionIFSsS8_EEEUlvE_vEEvEC1EOSF_
+}