Don't erase things for BMC if function call is staticcall

libsolidity/formal/BMC.cpp

@@ -587,6 +587,11 @@ void BMC::internalOrExternalFunctionCall(FunctionCall const& _funCall)
 			_funCall.location(),
 			"BMC does not yet implement this type of function call."
 		);
+	else if (funType.kind() == FunctionType::Kind::BareStaticCall)
+	{
+		// Do nothing here.
+		// Neither storage nor balances should be modified.
+	}
 	else
 	{
 		m_externalFunctionCallHappened = true;